Seven Secrets Salt Water Pool Sellers Don’t Want You To Know
SECRET #1 Salt water systems corrode the pool equipment.
The Facts – The salt itself has issues of attacking the cement in the plaster and deck materials. This is a relatively slow process when the salt levels are low. The salt also can kill any landscaping in or around the pool as well as in the backwash area.
If the sodium hypochlorite levels are too high, the corrosion is caused by the chlorine being produced by the electrolytic cell. Chlorine can bleach the test reagents, giving you a “false negative”, and people can grossly over-chlorinate their pool damaging equipment, the pool surface, lighting fixtures, and ladders. Over time the salt will attack any area the water evaporates at.
A common problem is corrosion at the ladder. The deck anchors are usually cast aluminum and the ladder should be stainless steel. The salt water will corrode the anchors overtime and a “safety event” will be pending.
Buyers should be aware that if you have salt water above 2800 ppm, (often 4000 to 5000 ppm), you will need to reseal your coping every year, especially if it is a porous stone like limestone or travertine. Otherwise, the salt will dry and start to etch the coping. Besides sealing the stone, it is also advisable and an added precaution to hose down the coping at the end of any swim day with fresh water. Although the salt water in the pool may not be corrosive at levels of 3000-3500 ppm, when that water hits the coping and evaporates, it leaves pure salt behind. The pure salt is corrosive and is the main cause of the corroding coping. Most autocover manufacturers now void their track warranty if a salt system is used.
Some pool builders are now refusing to build any salt water pools with cream limestone or taupe coping. Any customer that wants either coping for a salt water rock or gunnite pool must usually sign a release form. Pool builders have said that they have had to replace a significant amount of both these types of coping this past year. Cantilever designs simply disappear as the stone dissolves away.
SECRET #2 Salt water systems require chemicals almost every week.
The obvious weekly use of muriatic acid is combined with the not so obvious need to use cyanuric acid to guarantee your salt chlorine generator can achieve 1-3 ppm chlorine residual in your pool. Since salt water pools produce chlorine, the sanitizing effectiveness of the system is impacted by changes in temperature, bather load, sunlight and rainfall. CYANIDE based, the CYANURIC acid is euphemistically referred to as conditioner or stabilizer and must be maintained between 35 and 85 ppm. Stabilized levels over 100 are harmful to children, pets, older swimmers, the pool itself and of course the environment.
Occasional algaecide, clarifier, stain and scale control and shock will be needed with a salt chlorine pool (maybe slightly more than a stabilized “puck” pool) and only the handling of the solid chlorine is avoided. Numerous other sanitation devices will cut overall chemical use, a salt system may not.
SECRET #3 Salt water systems require cell replacement every 2 to 3 years at a cost of $500-$800.
With over 40 manufacturers in the salt water generator business the cell warranty ranges from 1 to 3 years and the replacement costs are from $500 self-installed to $800 installed by a dealer. Assuming the owner gets to the fourth year with the cell, salt can be one of the most expensive methods to sanitize the pool. If the cell does not make it through the third year, salt becomes the most expensive system in terms of operating cost.
SECRET #4 You must worry about the pH with a salt system and do regular maintenance or you will destroy the pool and have zero recourse.
The Fact – When the pH and alkalinity get out of balance, the chlorine is much less effective. The pH should be 7.4-7.6. Chlorinating with a salt water chlorinator is similar to chlorinating with liquid chlorine– they both have a high pH (11.7). One common problem is that homeowners tend not to test their pools’ pH and alkalinity enough. Unfortunately, too many builders and retailers sell these systems as a “set it and forget it” solution. Most people with salt systems will run their pH from 7.8-8.0. This is bad for two reasons: 1) the pool is in a scaling mode, and 2) the chlorine is locked up by the basisity of the higher pH. It is best to run between 7.4-7.6 when using chlorine. Lack of pH management can ruin the cell in less than 90 days, scaling up the swimming pool as well as the cell. “Improper chemical use” will void any warranty, a system employed by portable spa manufacturers on delaminated shells and first year heater failure.
SECRET #5 Salt systems are more harmful to human health than conventional chlorine, bromine or bioguanide chemicals.
With a salt system your skin will absorb sodium, salt, AND chlorine, versus just the halogen with a chemical sanitizer such as chlorine or bromine. Sodium absorption through the skin has long been known to present health risks at levels far below the 3000-5000 ppm levels salt chlorine generators require. For nearly 20 years people with high blood pressure, stroke history or other circulatory system issues have been asked to stop using their water softeners (at 200-400 ppm sodium in the water for just ten minutes in the shower) to avoid the heart mortality risks. The chlorine level and skin absorption of the chlorine is still based on the same 1-3 ppm chlorine residuals found, dioxin forms (as do chloramines) and the backwash water contains 3000 ppm or more chlorides.
SECRET #6 Salt systems are damaging to the environment and have been banned on all pools in areas such as Los Angeles County.
While the “Ban the Brine” movement may have not picked up much steam in recent years, individual counties banning chloride discharge such as Livingston County, Michigan or specific bans on salt water chlorine generators in Los Angeles County, California have gotten regional attention. Those existing Los Angeles area salt water generators when the ordinance was passed are NOT “grandfathered” in.
SECRET #7 One size does not fit all and salt generators use both high voltage AND high amperage outputs.
The Facts – It is essential when selecting a salt chlorinator to oversize the unit for your pool. You are better off having a chlorinator too large for your pool, one that is undersized is a complete waste of money. A chlorinator too large can be turned back or run for less time each day, making the cell last longer. A unit too small will mean algae problems later on if you don’t run it for longer periods each day or add extra chlorine on a regular basis. The high amperage output of the cell will add between 500 to 1000 watts per day or 1.0 KW to 1.5 KW to your electric demand and monthly bill, at .11 per watt, this is $5 to $11 every month. Electric rates range from .11 to .19 per KW and will not likely decrease in price.
There is no maintenance on a salt water pool.
Fact – All salt water generator cells require cleaning every 90 days. This must be carried out before the calcium build up within the cell housing becomes one big block. If not cleaned for six months, four expensive things occur, (even with the unit turned off the scale still forms): – The cell housing breaks when you attempt to clean it. – The cell life shortens as the high voltage/amperage cannot penetrate the scale on the plates. – The pool becomes a swamp when the cell scales up. – The electronic box blows – due to scale on the cell or salt ppm above 5000 in the pool. It is also very important to watch the salt level in the pool. A low salt level (less than 2000 ppm) will cause oxygen production and damage the platinum group metals on the cell anode, therefore, shortening the life of the cell. It is recommended that you try to keep the salt level at the higher end of the manufacturer’s scale, for your specific model.
With a salt water pool, the owner MUST maintain a proper pH or the pool will scale, stain brown and destroy the cell. Also cyanuric acid levels must be maintained or the chlorine will quickly dissipate out of the pool.
Before you buy a device and throw 200 to 500lbs of salt in your pool, remember an old term – “Salting the Earth”, 2000 years ago mankind knew better.
About the Author
Larry Couture
CEO of ECOsmarte
ECOsmarte has non-salt, non-chemical water technology installed in all 50 US states and 85 countries. In 2009 ECOsmarte received the Water Quality Association’s GOLD SEAL designation for its municipal water whole house systems.
http://www.ecosmarte.com
http://www.glasspackfilter.com
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