Thanks for the reply. I have been running my pool 24/7 for a few weeks to try to get rid of it but it's still there. I don't recall seeing this last year so I'm wondering if it is the cal hypo I used since it has a lot of inert ingredients. Or, I've been using the new Chlorox with the new ingredient (not sure what it is but it's supposedly has more whitening power).

I'll switch to generic bleach even though it's a little more money to see if that is the problem.

I've never used clarifier before so I'm wondering if that may help?

Thanks.