I have to admit, this has me quite perplexed. This is my 2nd season with the pool (24' above ground) and about halfway through last season I started with troublesome algae. Local pool stores have really not been much help. I'd like to adopt the BBB method and get this pool squared away, not much fun having a pool when you fight with it constantly.

So the persistent algae, which tends to show up on the steps esp., and the bottom, seems to be able to withstand high doses of bleach. I'm using test strips as I don't have a taylor kit (yet), but according to the strips, and the pool stores that have analyzed the water, it all looks good.

Last season I used Tri-Chlor 3" pucks and I think part of my problem was high CYA rendering the Chlorine ineffective, this year I'm trying to keep away from the pucks and my CYA is steady around 40-50.

I shocked the pool a few days ago (5L of 10% bleach) and yesterday I vacuumed, and backwashed. It's about 3pm and I have green on the bottom of the pool. I'm going away for the week, so I'm planning on hitting the pool with another 5L of bleach tonight.

Any advice is greatly appreciated