Confused on what to know about salt water pools? Our experts have you covered, detailing the important unique qualities that salt water pools offer. Today, chlorine generators in the swimming pool industry use an in-line system. This is a device that contains many cells with pool water passing through it.
Salt (sodium chloride) is added to the pool water to a level of 2500 to 3500 ppm. This is dependent on the manufacture and system. Low voltage DC electricity is applied to the inline cell. Then, the unit produces chlorine gas, hydrogen gas, sodium ions, hydroxide ions. However, there is no membrane or separator and the direct mixing of these products result in the formation of sodium hypochlorite instead of the evolution of elemental chlorine gas.
The sodium hypochlorite quickly makes hypochlorous acid (HOCl – the quick kill form of chlorine) and hypochlorite ion (OCl-). The hydrogen gas releases into the atmosphere as it bubbles up into the pool water. Very little of the hydrogen is in the ionic form in the water.
|For example in a pool of 30,000 gallons, the filter may be running 24/7. The salt water chlorine generator is on a separate timer which dials only to operate a percentage of that time. The internal timer on the unit is adjustable to fine tune the production of chlorine. Based upon calculations of one pound of chlorine per 10,000 gallons = 12 ppm; the unit being on 12 hours per day, the setting on the unit would need only be dial able in at about 40% production to achieve 1 ppm.|
Reaction that takes place in an inline Salt Cell:
Thus, this is called a Closed Loop System because the salt is used over and over again. The only loss is through splash out, carry out, back-washing, and rainfall.
Be careful, many salt products contain tricalcium phosphate to prevent caking. It’s insoluble and ends up on the bottom or in the filter. Notably, watch out for iodine, and do not use pelletized rock salt or water conditioner salt.
Note: A salt water chlorine generator should NEVER be on when there is no flow / pump is off.