using the bbb chart

[Watermom]

Also, just to verify ----- you did try the 'overnight test,' right?

That is where you test your pool in the evening after the sun is off of it, and then again in the morning within an hour or so of sunrise. If you lose no more than 1ppm of chlorine overnight, then most likely it is not algae.

[sobrien2]

yes its hard to tell with out the add on to my tester im waiting on so i have run it at 20 ppm since we talked.

[PoolDoc]

You might want to do the DE test -- it's rather common for sand filters on AG pools to have problems from oversized pumps. Dirt 'leaking' through the filter is absolutely a possible result of a filter with problems, particularly one that's missing some, but not all, the sand in the filter.

DE -test => http://pool9.net/de-test