Hi,

I have been fighting mustard algae all season so far. First time with this stuff and it is relentless. I just have a little, here and there on the bottom. Vacuuming to waste, and it comes back. I have kept my pool at shock levels for over 2 weeks, and it is still there. It is a vinyl liner, IG pool, with only grocery store chemicals, as Ben recommends here.

What is the next safest step for me. Do I have to add a copper algaecide? What are the ramifications of that? I hate adding anything other than what Ben recommends.

I don't want to fight this all summer, and need a solution that will not mess up my water chemisty.

Please help if you have any suggestions to keep me from messing up what I have worked so hard to do (Ben's method only) since my liner was replaced 2 seasons ago.

I don't want to jump the gun and regret something!

Thanks,
John