A MAJOR problem

[SL Dan]

Thanks for this and for the other info. I have to say this:

http://www.poolsolutions.com/gd/does...ill-algae.html

is amazing. But I don't quite understand what was done here. Lots of bleach and running the filter too? That seems almost too easy.

[PoolDoc]

So, you want harder??

(Yes, bleach plus filtration did that. It's a typical result for algae on a pool with ADEQUATE filtration, which means no AG sized sand filters.)

[SL Dan]

The photo thread doesn't say how much bleach was used, or how long the filtration was run - but it seems like if I'm willing to clean the filter, that might be the least wasteful method. As mentioned, I have a DE filter. My neighbor does his own pool work. I've been encouraging him to look at this site, so I have to show him those images. Its really impressive.

BTW, Costco advertises 6% Clorox @ $12.99 for a case of 6 96 oz. jugs.