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Thread: DE vs SandFilter with glass media?

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    prosper's Avatar
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    DE vs SandFilter with glass media?

    We recently moved and had a 36K gallon pool with Hayward DE ProGrid 60 cu/ft at our previous home.

    We are building a pool at our new house, 36k gallons as well.

    The selected pool builder left the option open for filter selection.
    Pentair 36" diameter sand filter with glass media, which he highly recommends..
    Or a Pentair 60 cu/ft DE filter.

    He is quite adamant that I would be happier with the sand filter, but I had 9 years of clear water from my DE filter on the last pool.

    Am I stuck in old times preferring DE?
    Are sand filters with Glass media really able to filter the same or better +/-5 Microns?
    35k gallon 20x45 inground concrete with vinyl liner - Stamped Concrete deck
    Pentair WhisperFlo 2HP - Pentair FNS Plus 60 DE
    Heat Siphon heat pump - Compupool cpx48
    Blue Diamond RC robot vacuum - TF100 testkit

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    duraleigh's Avatar
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    Re: DE vs SandFilter with glass media?

    What filters better (the answer, for practical purposes, might be neither) is not 1/10 as important as what you are familiar with and have been happy with. Stay with DE.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad Bama Rambler's Avatar
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    Re: DE vs SandFilter with glass media?

    personally I'd stick with the DE or I'd go for a huge cartridge filter. Sand is a wonderful filter system but in order of filtering size it's DE, cartridge and then sand, from smallest to largest particle that can pass it. Even glass media doesn't change that.
    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: DE vs SandFilter with glass media?

    I don't why he's trying to get you to switch from something you like. The 36 inch sand costs substantially more and has a higher flow rate so his opinion isn't profit based. We have never used the glass media but I would like to know why that would be any different than sand.

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    JasonLion's Avatar
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    Re: DE vs SandFilter with glass media?

    I agree with most everyone else, if you are happy with your current DE filter, stick with DE. The difference is far more of a personal preference than anything technical. It is much simpler and more predictable to stick with what you are familiar with. Now if you were dissatisfied with DE that would be a completely different story.

    There have been several reports of better filtering with glass media, compared to sand, and also many reports of problems with glass media. Some of the suppliers have had problems getting the particle size correct, especially as it can change (ie break down) in shipping.

    The theory I have heard is that glass has more sharp edges and also packs more tightly compared to sand, thus better filtering. Anecdotal evidence seems to support the better filtering, though apparently not quite as good as DE.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: DE vs SandFilter with glass media?

    Isn't glass made from sand/silica? So you make silica into glass by melting it and reforming it with two smooth sides, then break it up into pieces. I guess I don't understand how that would create more surfaces nor do I understand why sharp edges would filter finer particles. Maybe thats too simplistic a way to look at it but it sounds suspect to me.

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    prosper's Avatar
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    Re: DE vs SandFilter with glass media?

    Thanks for the feedback. I'll stick with what pleased me for years. DE.

    DE seems like it would be old tech these days, but dang it produces sparkling results.

    Maybe I should take the sand filter, sell it...buy the DE and keep the change.
    35k gallon 20x45 inground concrete with vinyl liner - Stamped Concrete deck
    Pentair WhisperFlo 2HP - Pentair FNS Plus 60 DE
    Heat Siphon heat pump - Compupool cpx48
    Blue Diamond RC robot vacuum - TF100 testkit

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