Alum, borax, etc.

[PoolDoc]

To use sodium percarbonate on a badly fouled pool (in other words, a swamp with lots of stuff on the bottom!)

If you do this, next spring, I'd be grateful if you'd do pictures and record doses and results.

I've done something similar in the distant past, but we don't have enough info to know exactly when and how to recommend it.

[waterbear]

My pool stays open year round and never turns green and I am not working on other people's pools these days.

[PoolDoc]

Yeah, that's sorta my problem, too.