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by ovion21
Wed Dec 05, 2018 9:59 am
Forum: Filtration
Topic: Pool filter sand
Replies: 12
Views: 9007

Re: Pool filter sand

I have been noticing in one of my tanks that has pool filter sand, the sand at the bottom of the tank it turning blackish gray. The tank does not smell and after I do a water siphon, the sand from the bottom comes up and I see the color change. After about 12 hours or so the black sand disappears. ...

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