What to Do If a Salt Water Pool Turns Green?
The term saltwater pool is a bit of misnomer. The water in the pool isn't really "saltwater." Saltwater pools use a device called a salt-chlorine generator, which is plumbed into the pool's circulation system. Salt is place in the water and when the water circulates, it passes through the generator. Through the process of electrolysis, the salt is converted to common chlorine (hypochlorous acid) and then returned to the pool. If chlorine levels are properly maintained, you should have crystal-clear water all the time. Does this Spark an idea?
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Why It Turned Green
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Since the salt in the pool is converted into chlorine by the generator, chlorine levels in the pool should be correct and able to combat any algae growth. However, if alage blooms do appear, it's because chlorine levels, as well as other chemical parameters, such as pH, are off.
Solution
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If chlorine levels in the pool are not correct, it may be due to a problem with the chlorine generator. Have a pool technician who is familiar with the technology run a diagnostic check on the equipment. If the generator is operating correctly and the chlorine residuals are correct, then check other water parameters. Chlorine is most efficient at particular pH levels--it's about 10 times more efficient at a pH level of 7.2 than it is at 8.2. Adjust the pH levels if necessary.
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Types of Salt
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It's important to use the right type of salt to keep the chlorine generator working properly. According to poolcenter.com, you can use water softener pellets, solar salt flakes, and water conditioner salt. Avoid rock salt and table salt with iodine; the salt should be as pure as possible. Check with your chlorine generator manufacturer about what type of salt to use if you're not sure.
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