Quote Originally Posted by mastamoon View Post
One if which describes what the cya I got contains. Label says cya and sodium bicarbonate but has no percentages. Is that OK?
If you mean, will it hurt your pool? Probably not. If you mean, should you buy it in the future? No, that's how pool companies play games to sell less for more. Is this the Namco product?


12.5% sodium hypochlorite gallons for 2.99, which is the same price I get 6% bleach for. Any reason to just not buy the liquid shock?
It may be a good deal. There are two problems. First, if it's not fresh, and not kept cool, it breaks down VERY rapidly at summer time temperatures, releasing oxygen gas. Second, household bleach is usually filtered for iron, but not all industrial bleach is. You can test both: add household bleach one evening, and see how much FC increases after 1 hour. Repeat with the industrial bleach. If it increases 2x as much (or is close) it's a good deal. Then, take the used household bleach, and put about a quart of industrial bleach in it. (Watch the spills: the 15% bleach I used to work with makes cotton 'evaporate'!!) Put the jug in the hottest place you can find around the hose, preferably also exposed to sunlight. Leave the lid a little loose. Check it after two weeks or so. If there's a bunch of iron sediment in the bottom, you may want to think twice.