above ground pool with salt

Algae problems in swimming pool water.
Green (cloudy) water or slimy pool walls.
Black algae. Mustard algae. Pink or white pool mold.
ian straker

above ground pool with salt

Postby ian straker » Mon 12 Nov, 2007 07:29

my pol is an intex above ground pool it has algy problem some people say it needs shock treatment but im not sure if that is possable with a salt pool or if i can mix clorine with the salt :? or if this will resolve the problem and if so how do i go about it :?

chem geek
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Postby chem geek » Mon 12 Nov, 2007 13:10

A salt pool is a chlorine pool. A saltwater chlorine generator (SWG) generates chlorine and this is identical to adding chlorine manually in the pool. So yes, you can use chlorinating liquid or unscented bleach to shock your pool with chlorine. You could also use Cal-Hypo though that will increase Calcium Hardness (CH) which for infrequent shocking is probably not a problem.

What is your pool's Cyanuric Acid (CYA) level and what level of Free Chlorine (FC) were you maintaining with the SWG? If you don't keep a minimum FC level of 4.5% of the CYA level in an SWG pool, then you won't have enough chlorine to keep away algae. An SWG pool can have lower chlorine levels due to the more frequent dosing and the superchlorination in the SWG cell, but a minimum chlorine level is still needed. It could be that you don't have enough CYA in the water if the chlorine breaks down from sunlight too quickly -- you want some CYA, but not too much. For SWG pools, a CYA level of 60-80 ppm is typical with an FC of 2.7 - 3.6 minimum.

For shocking the pool against algae, it takes a high level of chlorine -- usually an FC that is 40% of the CYA level to have the algae clear up fairly quickly. At a minimum, you would need an FC level that is at least 20% of the CYA level to kill the algae slowly and in any event you need to keep adding chlorine to maintain the FC level until the algae is completely cleared -- algae will use up a lot of chlorine rather quickly. Another alternative, though expensive, is to use a phosphate remover. If you don't have one already, get yourself a good test kit, the Taylor K-2006, from Taylor here or from Leslie's here or from poolcenter.com here (careful: not the K-2005 -- make sure it's the K-2006) or the even better TF100 test kit from tftestkits.com here.


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