Green Algae, Sand Filter - Add DE?

Algae problems in swimming pool water.
Green (cloudy) water or slimy pool walls.
Black algae. Mustard algae. Pink or white pool mold.
Pool Newbie
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Joined: Thu 19 Jun, 2014 22:21
Location: NY

Green Algae, Sand Filter - Add DE?

Postby Yazzinit » Thu 19 Jun, 2014 22:23

I have a 16x32 inground pool and cannot get rid of the green algae.

I have added tons of shock and stabilizer while running my Hayward sand filter. I was told adding a few pounds of DE could help improve the filtration. Is this true? I'm not having much luck getting rid of the green algae and I'm trying to find an efficient way, as I keep wasting time and money on chemicals without results.

Thank you.

chem geek
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Green Algae, Sand Filter - Add DE?

Postby chem geek » Thu 19 Jun, 2014 23:22

If the "shock" was Dichlor (or Trichlor granular) then you've been increasing the Cyanuric Acid (CYA) level in your pool that reduces chlorine effectiveness. If your "shock" was Cal-Hypo, then that increases Calcium Hardness (CH). You should have SLAMed your pool. And yes, for finer filtration you can Add DE to a Sand Filter.

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