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Thread: I'm confused!

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    I'm confused!

    This will be my second year with my beautiful pool. The lateral assembly on my sand filter broke, and I had to order a new one (and now I have an algae bloom...grrr). I want to put the new assembly in asap so that I can start working on the algae problem, but I noticed that the sand seems low. I have a Hayward Dreamline filter, and the manual says the sand should be 6" below the top of the filter tank. It also says I should buy No. 20 silica sand.

    When I look up that sand, there are warnings all over the place that No. 20 silica sand should NOT be used for pool filters.

    So what do I do? Are there two types of No. 20 silica sand?

    Please help. I need to get the neon green water gone, and quick!!
    14k gallon oval agp, sand filter, 1hp pump, BBB method, K-2006 Test Kit
    Roanoke, VA

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    Mod Squad Bama Rambler's Avatar
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    Re: I'm confused!

    #20 sand is the most common size for pool filters. Where did you read that it should not be used for pool filters?

    I'd go with what the mfg of the filter recommends.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: I'm confused!

    I googled No. 20 silica sand, and there are tons of links for it. Several of them (I think Home Depot was one of them) said never to use it for pool filters because it is mixed with glass??? I just wanted to double check with a site I trust before I did anything so I don't damage anything.
    14k gallon oval agp, sand filter, 1hp pump, BBB method, K-2006 Test Kit
    Roanoke, VA

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    Mod Squad Bama Rambler's Avatar
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    Re: I'm confused!

    Just make sure it says for pool filters on it and you'll be fine.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    CUTiger78's Avatar
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    Re: I'm confused!

    If Hayward recommends it, I'd use it. As a matter of fact, I did use it in my first Hayward filter.

    All the warnings I see refer to breathing the silica dust from silica sand. So, maybe, wear a mask when adding silica sand to your filter.

    Good luck.

    P.S. If you don't want to use #20 silica sand, there's always the zeolite products or glass.
    36K gallon 42X22 gunite/plaster kidney-shaped IG;
    1 hp Hayward Super Pump (new in 2012);
    Hayward S244T sand filter w/ Zeosand (both new in 2009);
    175K BTU LAARS Lite2 LG natural gas heater; Polaris 380;
    TF-100 test kit.

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