Yousawred

I am having a similar reaction in my pool. I have an 18' round above ground pool with a sand filter. I used HTH super shock (1 packet-active ingredient is calcium hypochlorite), and about 15 oz of BioGuard Banish algae killer (active ingredient is copper) 2 days ago (per the advice of a pools and spas store clerk). I had an almost completely green algae pool bottom and the water looked like lake water. By the afternoon, the algae had cleared up and the pool water looks nice and clear again, except yesterday evening I started noticing a light film developing on the top of the water with tiny bubbles. I have backwashed and rinsed the filter a few times since the treatment and it seems to be working properly, so I am unsure what to do now. A free chlorine/bromide and five minute Total chlorine test revealed, from what I can tell, absolutely no chlorine in the water at all, and the PH test showed about 7.6-7.8. Any advice would be appreciated.