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Udo
Elite Nomad
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Registered: 4-26-2008
Location: Black Hills, SD/Ensenada/San Felipe
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I THINK I FOUND THE DEFINITIVE BAJA WATER QUALITY REPORT, AT LEAST FOR BAJA SUR
I was doing some research as to which water filtration system to purchase for Baja water, and two of the companies asked for a water quality report.
To date, no one got back with me yet, except for one company that offered a high volume reverse osmosis system.
I found this @ http://www.aguadebaja.com/article4.html
Chris Salter, October 2010
Everything in water, that is not water, is a contaminant. Not all contaminants are harmful: indeed, some may be considered to be beneficial.
Unfortunately, many of these "beneficial" contaminants may not be welcome visitors to your expensive appliances such as hot water heaters or boilers,
washing machines, dishwashers, or household plumbing and bathroom, kitchen and swimming pool tiles etc., or even your hair and skin after having a
shower.
LOCAL WATER in La Paz
La Paz Municipal delivered water is usually somewhere between 650 - 850 ppm TDS (parts per million Total Dissolved Solids) which includes 20 - 25
grains per gallon of hardness, mostly calcium and magnesium (5 grains per gallon is considered to be hard water), so the water is extremely hard, and
can contain elevated levels of arsenic and nitrates. If metered, this water costs around 22 Pesos per cu. M.: If not metered, it may be somewhat
less.
In addition, the water contains a significant amount of suspended solids which may from time-to-time include the pathogen family of bacteria, virus,
algae and possibly occultist cysts (cryptosporidium etc.). The turbidity is probably in excess of 5 Nephelometric Turbidity Unit's (NTU's). The US
EPA and the WHO recommend a level of less than 1 NTU in potable drinking water.
Turbidity is the cloudiness or haziness of a fluid caused by individual particles (suspended solids) that are generally invisible to the naked eye,
similar to smoke in air. The measurement of turbidity is a key test of water quality.
Fluids can contain suspended solid matter consisting of particles of many different sizes. While some suspended material will be large enough and
heavy enough to settle rapidly to the bottom of the container if a liquid sample is left to stand (the settable solids), very small particles will
settle only very slowly or not at all if the sample is regularly agitated or the particles are colloidal. These small solid particles cause the liquid
to appear turbid.
LOCAL WATER in La Ventenas/El Sergento
La Ventenas/El Sergento Municipal delivered water is around 3,200 ppm TDS. The high level of total dissolved solids is a result of sea water intrusion
into the underground water supplies. In addition the water has the same hardness and turbidity characteristics as La Paz Municipal water, but is also
known to contain elevated levels of arsenic, nitrates and cyanide. Pretty grim stuff.
Trucked-In Water.
Trucked-in water, from a different source to the Municipal delivered water, is normally around 550 - 650 ppm TDS with about 20 grains per gallon of
hardness. This water will cost around 55 to 65 Pesos per cu. M. Again, this water will also contain a considerable element of suspended solids.
Treatment & Conditioning Options
Technology exists, by which we can remove ALL of the suspended solids by direct filtration. The removal of the smallest suspended solids, including
the pathogen family, and, at the same time, to provide an adequate flow of water, will result in a higher capital cost for the filters, and the
subsequent replacement elements.
A professional water treatment and conditioning specialist has to determine the maximum amount of water you will probably consume on any given day
together with the maximum amount of water you will be consuming at any given moment in time…and with that information they have to design accordingly.
Traditionally, in the USA, the hardness would be treated with salt water softener systems. These are currently being gradually banned in many US
States and are not a good solution for B.C.S. as you are just adding more salt to the water. In addition, a POU (Point-of-Use) under-sink Reverse
Osmosis system will be essential for the salt removal of cooking and drinking water.
ANY specific dissolved contaminant can be selectively removed by ion exchange resins or selective treatment media (there are far two many contaminants
in local water to even contemplate this solution as this would be totally cost prohibitive) OR around 99.5%+ of dissolved contaminants can be totally
removed by either Distillation (which is both messy and again cost-prohibitive), or hyper-filtration membrane treatment (Reverse Osmosis) which will
incur an element of waste water and an energy cost.
Whatever solution or combination of solutions that is recommended or selected, there has to be a trade-off ….there is no universal panacea, although
some salespeople will tell you otherwise. These people are nothing more than Charlatans or Alchemists.
R.O. MEMBRANE TREATMENT SYSTEM:
In La Paz Municipal water or trucked-in water this would involve the installation of a Reverse Osmosis (R.O.) treatment system installed at the POE
(Point-of-Entry) to the property.
Assuming you are living in La Paz and your maximum demand is 300 gallons per day (gpd), the trade-off cost in reject water is another 150 gpd (i.e.
66.66% recovery) this will total 450 gpd or around 1.70 cu. M per day. At maximum occupancy and usage this will cost around 37 Pesos per day for the
Municipal water or around 102 Pesos per Day if you are using trucked-in water.
If you live La Ventenas/El Sergento you will need a membrane system with a slightly different design operating at higher pressure that will waste 300
gpd (i.e. 50% recovery). This will total 600 gpd or around 2.27 cu. M per day. At maximum occupancy and usage this will cost around 50 Pesos per day
for the Municipal water or around 120 Pesos per Day for trucked-in water.
Fortunately, most local based homes probably only use around 150 gallons on an average day, so the above cost analysis can be cut in half.
Some of the reject water can be used for toilet-flushing (if there is a separate water line to the toilets) and irrigation, although it is not
suitable for irrigation in La Ventenas/El Sergento due to the high salt-content. However, it can be used for drive-watering as the salt content tends
to compact the sand and dirt.
The product water will be around 35-40 ppm TDS (i.e. high quality potable water)…most bottled waters in La Paz are in the 20 -60 ppm TDS range.
This system will remove ALL suspended contaminants and 99%+ of all dissolved contaminants.
If any specific property in the development requires PRISTINE QUALITY Water, they can always install an additional POU (Point-of-Use) under-sink
low-pressure R.O. system for their Ice- Makers etc. but this is really luxury personified.
SUB-MICRON FILTRATION and CONDITIONING SYSTEMS
We can address the vast majority of the suspended contaminants, including ALL of the pathogen family at POE by direct filtration, and change the
chemical constituency of the hard water by converting the damaging calcium and magnesium ions into a crystal form (Template Assisted Crystallization).
In this format, the calcium and magnesium remain in the water and, as such, are beneficial to human consumption, but will prevent all of the
lime-scale damage to appliances, plumbing, water heaters etc. Indeed, over a period of time they will gradually remove existing lime-scale.
These systems require no electricity, no salt, no energy, have no waste water and, as such, it is a totally GREEN solution and are normally installed
at POE after the hydro-electric delivery pump.
However, this will not address the high level of dissolved contaminants in the water, other than the crystallization of the hardness ions.
Consequently, some people with highly sensitive palettes, and everybody in La Ventenas/El Sergento, may detect a slight "salty taste" to the water for
drinking and cooking, and the ice will still contain these dissolved contaminants.
Again, this can be addressed by installing a low-pressure POU under-sink R.O. system which will provide up to 50 gpd of good-quality WATER per
residence for drinking, cooking, ice-making etc.
ULTRA-VIOLET DISINFECTION (UV) and FILTRATION SYSTEM
For some quite unaccountable reason these systems are quite popular in BCS. Unfortunately, very few are initially correctly specified and even less
of them are adequately maintained. There is no doubt that when correctly specified and regularly maintained these systems can address most of the
pathogen concerns in Municipal and Well water.
Ultra-violet (UV) treatment is the disinfection process of passing water by a special light source immersed in the water in a protective transparent
sleeve: the special light source emits UV waves that can inactivate harmful microorganisms. The ultra-violet rays, similar to the sun's UV but
stronger, alter the nucleic acid (DNA) of viruses, bacteria, molds or parasites, so that they cannot reproduce and are considered inactivated.
UV systems alone are neither intended to treat water that is visually contaminated nor intended to convert wastewater to safe, microbiologically
potable water.
UV treatment does not alter the water chemically as nothing is added except energy. It should be noted that inactivated microorganisms are not removed
from the water. UV treatment does not remove dirt and particles, metals such as lead or iron, or hard minerals such as calcium, and consequently do
not address any hardness and scale issues that are prevalent in BCS water supplies. Other devices are required to remove these particles, metals and
minerals.
UV systems exist to treat all possible flow ranges, from small POU applications to entire municipalities. For household applications, a POU or POE UV
system can be used. A POU system is a small, portable device that attaches to a faucet and rests on the counter: it can also be mounted under a
counter. Larger POE systems are also available which are installed where the water supply enters the home, disinfecting the entire household water
supply.
Class A systems can be both POE and POU (large or small); and, are designed to inactivate and/or remove microorganisms including bacteria, viruses,
Cryptosporidium oocyst and Giardia cysts from contaminated water. However, they are intended to be installed on visually clear water (not colored,
cloudy or turbid water) and not for converting wastewater or raw sewage to drinking water. Class B systems are intended to reduce nuisance
microorganisms and are not intended for disinfection.
Class A systems deliver a dose of 30 to 40 mj/cm2, enough to be used on water supplies which are not considered safe. A dose of 40/cm2 is recognized
by Health Canada, US EPA and the WHO as sufficient for this type of application.
POU systems can be self- installed; however, it's important to know the condition of your water before use in the case you need pre-filters, which
will be ABSOLUTELY ESSENTIAL in BCS. With POE systems, there are a number of aspects that need to be considered when installing a unit. These include
assessing the condition of the incoming water, the need to install some pipes and the need to properly disinfect the system. You may want to consult a
professional if a more complex system (one that uses filters) is required.
Water must be free of soil or sand particles (it should look clear and not cloudy). Such particles can block the UV rays and allow harmful particles
to survive. Accordingly, a UV system normally has a five-micron filter installed upstream from the UV unit. A one-micron absolute filter should then
be installed after the five-micron filter to remove cysts (small capsule-like sacs that enclose organisms).
The UV unit is installed after these filters. There are characteristics that can affect UV effectiveness such as water hardness, alkalinity, pH, and
iron concentrations etc. Water should be therefore tested before installation to see if it will need additional treatment. This will assure proper UV
disinfection. Contact a UV manufacturer or a water-testing laboratory to arrange a test.
For total UV disinfection suspended particles are a problem because microorganisms buried within particles are shielded from the UV light and pass
through the unit unaffected. However, UV systems can be coupled with a pre-filter to remove those larger organisms that would otherwise pass through
the UV system unaffected. The pre-filter also clarifies the water to improve light transmittance and therefore UV dose throughout the entire water
column. Another key factor of UV water treatment is the flow rate: if the flow is too high, water will pass through without enough UV exposure. If the
flow is too low, heat may build up and damage the UV lamp.
UV units operate at a low cost. The bulb gradually loses its disinfecting capabilities over time. It should be changed by you at least once a year -
even if it is still operating. An annual filter/lamp replacement can be approximately $150. A lamp/bulb alone may cost from $40 to $100.00 depending
on the wattage of the bulb. Electricity costs are another consideration; however, the system is similar to running a 60W bulb. There is no additional
water cost for running a UV system, as all of the treated water is available for consumption.
The quartz sleeve surrounding the bulb must be kept clean in order for the unit to function safely. It should be examined once a month; and if it
becomes cloudy, it should be cleaned. Note: that no one system can treat water 100 per cent, and without proper maintenance it should not be
considered 100 per cent reliable.
Other treatment devices may be required in addition to UV. Prolonged storage of water treated using UV, as the sole method of treatment, is not
recommended. If your drinking water comes from a private source, (such as a well), be sure to have your water tested periodically to ensure it safe
to drink.
All products that come into contact with drinking water need to be certified to the appropriate health-based performance standard developed by NSF
International. In the case of Ultra-Violet Light units, it is recommended that they be certified as meeting standard NSF/ANSI 55 for Class A devices.
Components employed in conjunction with the UV system should also be certified to meet other applicable NSF/ANSI Standards. These standards are
widely accepted in North America, as they ensure the removal of specific contaminants, as well as the performance and mechanical integrity of the
materials that come into contact with drinking water. Check the UV treatment unit's packaging or ask your dealer for a listing of the substances that
the unit is certified to remove.
As a guideline, for a one-bathroom home or condo your UV system should be rated (and NSF certified) at a minimum of 3 gpm: a 5 gpm system for a
two-bathroom residence: a three-bathroom residence should be 7 gpm: a four-bathroom residence should be 9 gpm, and for larger residences it should be
15 gpm+. Restaurants and hotels may need systems up to 150 gpm. It is extremely doubtful if any POE system in BCS can get by with standard 2.5"
diameter x 10" long filter housings to provide for the adequate flow and treatment media contact time. Housings that are 4.5" diameter x 20" long
should be the minimum that are specified.
In summary, for the local waters of BCS, a RO Membrane system or a top-quality sub-micron filtration and conditioning system would be far better
options than a under-specified UV system.
For operating cost comparison, Bottled Water in 17 liter/5 gallon Garrafones will cost between 600 - 850 Pesos per cu.M and in those small disposable
bottles the cost is between 6,000 8,000 Pesos+ per cu. M.
Udo
Youth is wasted on the young!
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rob
Senior Nomad
Posts: 509
Registered: 10-19-2004
Location: Pacific Coast, BCS
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Udo - thanks for that. I looked at water treatment a few years ago (we have a ranch well with hard water but otherwise pretty good), what I can't get
around is that 99% of domestic water goes down the drain and the purified stuff you buy for drinking costs 8 or 9 pesos per garafon/5 gallons.
Tough to beat that price.
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Udo
Elite Nomad
Posts: 6364
Registered: 4-26-2008
Location: Black Hills, SD/Ensenada/San Felipe
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Within my research, Rob, I was much more shocked by the hardness of the water than the quality in itself.
In judging the filtration systems, it appears that hardness is much easier to dissipate than other filtration systems.
I was seriously looking at the Pelican water filtration system (they are one of the ones that asked for a water-quality report), however, they are one
of the ones that has failed to get back with me.
Udo
Youth is wasted on the young!
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gnukid
Ultra Nomad
Posts: 4411
Registered: 7-2-2006
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Thanks Udo
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C-Urchin
Nomad
Posts: 234
Registered: 12-17-2008
Location: La Paz
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water
I am in La Paz. What do I get???
*Be the man your dog thinks you are
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gnukid
Ultra Nomad
Posts: 4411
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Bottled water is cheap and good quality. In fact its free at various locations.
For house water use pressurized systems and micron filters to improve quality for showers and cleaning, if you want to add a system to reduce
hardness.
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Udo
Elite Nomad
Posts: 6364
Registered: 4-26-2008
Location: Black Hills, SD/Ensenada/San Felipe
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In December of this year I will be traveling to La Paz area, and I can probably fit two filtration systems in my FJ Cruiser and deliver them.
Udo
Youth is wasted on the young!
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Russ
Elite Nomad
Posts: 6742
Registered: 7-4-2004
Location: Punta Chivato
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Good report.
22 pesos per cubic meter? In Chivato we're charged $5 (dollars) per cubic meter. Well, we do conserve water
Bahia Concepcion where life starts...given a chance!
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ncampion
Super Nomad
Posts: 1238
Registered: 4-15-2006
Location: Loreto
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Good article and info on water quality. Thanks.
We live off-grid North of Loreto and have trucked-in water. Just tested it with my TS meter and it reads about 600 - 610 TDS. The botteled water
that we use for drinking is 005 TDS. Looks like our water here is better that La Paz. I'm looking into the idea of an RO system to supply our water
instead of the truck. Only problem is the pump motors are pretty "energy hungry" and will tax my current solar system. Anyone tried to make drinking
water out of sea water with RO??? The crusing boats do it all the time.
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capitolkat
Senior Nomad
Posts: 510
Registered: 3-9-2006
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New House
We will be on the municipal system in El Centenario- in the hills on the West side of the Bay of La Paz-. We did the tests on the water delivered by
the municipality. Really hard, so we are softening it, and some TDS issues so we will have a whole house filter to remover the majority of the
dissolved solids, but at the two sinks in the living area there will also be two RO taps for drinking and cooking water.
WE have been in Comitan renting for the last 9 months while the house is being built and had trucked in water. Not much I can do with it in a rental
house and it's really hard. Everything spots, but the taste is OK for teeth brushing and showers, but for drinking - like others have said bottled
water is cheap at City Club or Sam's club so we keep a couple of gallons in the frig and everythig is OK so far.
Life is too short to drink bad wine
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rob
Senior Nomad
Posts: 509
Registered: 10-19-2004
Location: Pacific Coast, BCS
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ncampion - re seawater RO. Back in the days when I was rich I put a PUR 12v RO unit in my camper - idea was to run a hose down to the sea (the
scenario was definitely Sea of Cortez-side!) and use the camper solar to run the system.
It worked fine, I could stay indefinitely on lonely beaches, but you had to keep a close eye on the intake (tides, sand etc) and finally sold it to a
boater. I still have my handheld PUR RO unit in the boat - it works fine - I could bring Arnold Schwarzenegger to his knees by shaking hands after a
few weeks of handheld RO production . .
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BajaBlanca
Select Nomad
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Registered: 10-28-2008
Location: La Bocana, BCS
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Scott who lives here in la bocana but is not here at the moment for me to get the details, bought a machine that creates water from the moisture in
the air. It is a bit noisy but he sure has lots of agua.
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BajaGringo
Ultra Nomad
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| Quote: | Originally posted by ncampion
We live off-grid North of Loreto and have trucked-in water. Just tested it with my TS meter and it reads about 600 - 610 TDS. The botteled water
that we use for drinking is 005 TDS. Looks like our water here is better that La Paz. |
I assume those readings are in ppm or mg/L. Two to four hundred parts per million is pretty common in most NOB municipal water systems and it is not
uncommon to find even higher. Ideally TDS (total dissolved solids) would run in the 50 to 100 range and only 5 parts is nearly distilled water quality
- not recommended for long term use as sole source for drinking water.
While the dissolved inorganics are something to keep in check, I am more concerned with more potentially harmful suspended solids as well as
biological and organic constituents too often found in water sources, north and south of the border.
And they are not picked up by your TDS meter either...
[Edited on 7-28-2011 by BajaGringo]
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vandenberg
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| Quote: | Originally posted by lencho
Back in the '90s there was research done at the CIBNOR (Dr. Miguel Angel Porta) on solar distillation of sea water, with encouraging results. As I
recall, at home he had a couple square meters on his roof which provided for the personal consumption for several people. Only power required was to
move the water to the roof...
--Larry |
And haul the residue off the roof, of course.
But...a good way to make your own seasalt.
My A/C's make more than 5 gallons of condensation water daily. Looks good enough to drink.
The houseplants love it.
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Osprey
Ultra Nomad
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Location: Baja Ca. Sur
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Our water in La Ribera I believe is just a little harder than that used in La Paz. The whole village buys purified water during and after hurricanes.
We buy it to drink at 10 pesos for 5 gallons.
Our 16 year old propane water heater must like the solids in our city water and we deal with the spots with CLR from Home Depot. Not a lot of
problems, not a lot of hassle or cash layout and we don't think we have been suffering from impurities in the sinks and the shower.
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Jack Swords
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Location: Nipomo, CA/La Paz, BCS
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Before Marina de La Paz put in the RO system, there was lots of spotting when cleaning boats. With the RO system the spotting is gone, water is
potable, and it leaves more water for the city of La Paz. Costa Baja marina also has a RO system. Might be a future for RO. The Marina has to clean
the membranes about every 3 days.
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Udo
Elite Nomad
Posts: 6364
Registered: 4-26-2008
Location: Black Hills, SD/Ensenada/San Felipe
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George,
Regarding using CLR to clean hard water deposits...
Here, at the RV park in Orange, CA. we have very hard water (30 grains). The local residents use straight vinegar to clean the water deposits. Does
just as good for 1/10 the price. At our local Home Depot, a gallon of CLR is $24.00! A gallon of vinegar is about $3.00 at Smart & Final.
| Quote: | Originally posted by Osprey
Our water in La Ribera I believe is just a little harder than that used in La Paz. The whole village buys purified water during and after hurricanes.
We buy it to drink at 10 pesos for 5 gallons.
Our 16 year old propane water heater must like the solids in our city water and we deal with the spots with CLR from Home Depot. Not a lot of
problems, not a lot of hassle or cash layout and we don't think we have been suffering from impurities in the sinks and the shower.
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Udo
Youth is wasted on the young!
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ncampion
Super Nomad
Posts: 1238
Registered: 4-15-2006
Location: Loreto
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Mood: Retired and Loving it
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| Quote: | Originally posted by lencho
| Quote: | Originally posted by vandenberg
And haul the residue off the roof, of course.
But...a good way to make your own seasalt. |
Uhh... why poke fun at something you're unfamiliar with?
This was a dynamic system which used part of the water for self-flushing, similar to the way R.O. systems which (I think) don't require constant
intervention. Primary problem I see with that, as with R.O., is environmental impact of the returned brine, which on a single-household level is
pretty far down in the noise...
--Larry |
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ncampion
Super Nomad
Posts: 1238
Registered: 4-15-2006
Location: Loreto
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| Quote: | | Quote: | Primary problem I see with that, as with R.O., is environmental impact of the returned brine, which on a
single-household level is pretty far down in the noise...
--Larry |
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RO systems that make drinking water from sea water have a 90% rejection rate. That means that the returned "brine" is only 10% saltier than the sea
water. Hardly something to be concerned about especially with a small system. I'm tired of always hearing about the "environmental impact" of
everything we do.
.
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Cielomar
Junior Nomad
Posts: 71
Registered: 12-5-2010
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I have used a GE under-the-sink RO (reverse osmosis) system for several years for drinking water only. I change the filters annually and have had no
bad effects. The system was pretty cheap and it took me about 3 hours to install it. Very dependable and easy to maintain and operate. They make
bigger units for general use (other than drinking water) but I never saw the need for them. Beats driving into town to get another bottle of water
when I run out.
www.geappliances.com/products/water/drinking_water_filtratio...
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