Dead algae is hard to filter out.
If you can vacuum to waste (common with sand filters), after ALL the algae is dead, try turning the pump off, and letting every thing settle.
Using DE can help, somewhat, but it can also make things worse if your filter is low on sand, or coupled with an over-sized pump.
If the algae is not 100% dead, consider putting your filter on "recirculate", and bypassing the sand. The reason is, when the algae goes through the sand, but is not filtered out, it can be broken up into even finer particles that are hard to get rid of.
Do all these things:
1. Get a local OTO/phenol red test kit (yellow/red drops) and hold the chlorine in the orange-ish yellow rage ( > 10 ppm) till ALL the algae is dead.
2. Order a K2006 kit (Amazon link in my signature) so we tell what the chemical conditions in your pool actually are.
3. If you like add 1 -- just 1 -- dose of clarifier and/or floc. But NO MORE! Overdosing can make things much worse. Do NOT use these till the algae is dead! Do NOT use more than the label recommends. If you use floc, you MUST follow label instructions.
Bookmarks