Hi Lawrosa;

I looked at your thread.

The bleach did what it should: killed the algae and oxidized what it can.

The problem is, your filter is not doing what it should: removing what was killed. A functioning filter's pressure will go up rapidly when you try to filter a white snow storm like yours . . . and that's what's happening when you add DE.

But it's absolutely common for undersized sand filters to be coupled with oversized pool pumps on AG pools . . . and to produce precisely the results you're getting. I first wrote a page about that on PoolSolutions back around 1998.

Ben