Quote Originally Posted by nthach View Post
The only "gimmick" I've seen that somewhat works is Green To Clean.

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This is just a source of organic ammonia to create monochloramine and negate the effects of high CYA. It (and sodium bromide) are often a cure worse than the disease since they create a huge chlorine demand after.
Monochloramine does help kill algae since they see it as a food source, a lethal one.