Is this stuff ok?


LifeTime Supporter
May 18, 2009
I sent my wife to the pool store to get polyquat algaecide and they sold her this stuff call Sea/Gard Winter Chemical and told her this is the best stuff for winter instead of polyquat. It has 3.5% Copper Dulfate and 2.5% N-Alkyl Dimethyl Benzyl Ammonium Chloride and .01% Dialkyl Methlyl Benzyl Ammonium Chloride.

Stupidly, I put it in the pool without checking or asking.

Am I ok with this? Presumably, I don't need to also add algaecide.

Thanks in advance for any comments or suggestions


TFP Expert
In The Industry
Jun 12, 2009
Exeter, PA
well it has copper in it and most people on here are going to tell you that metals can lead to staining. I use an algaecide 60 aka Poly(oxyethylene) (dimethylimino) ethylene (dimethylimino) ethylene dichloride 60%. But I only use this chemical if it's a mesh / safety cover. If you have a tarp cover that is in relative good condition keeping the fc level at it's ideal level when covering will be all you need.


TFP Expert
May 1, 2007
Orlando, FL
...this is the best stuff for winter...
Probably 'best' profit margin for the store.

Copper actually will work as an algaecide, but I believe that the levels you need to be effective are high enough to stain pools and hair. We advocate stopping and preventing algae via the use of chlorine, but if you need an algaecide, your best bet is polyquat.

Maybe, given that you're closing, it should just be OK for the winter. I'll defer to someone with more metal experience.

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