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Thread: Need some clarification on using DE with a sand filter

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    Brentr's Avatar
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    Need some clarification on using DE with a sand filter

    Hello, my friend brought this to my attention. I have seen posted that you can add DE to a sand filter and you would get better filtration. How is that possible????? Sand filters filters up to 10 microns so if you added DE which filters up to 2 microns then it should pass thru the sand. Is that correct? Can someone please explain in detail what is happening when you add DE to a sand filter?
    Thanks in advance
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    Mod Squad woodyp's Avatar
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    Re: Need some clarification on using DE with a sand filter

    10 and 2 microns are NOT the sizes of the sand or the DE. DE just helps catch the smaller stuff.
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    Richard320's Avatar
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    Re: Need some clarification on using DE with a sand filter

    Think of sand as a screen with 10 micron holes and DE as a screen with 2 micron holes. The DE sits on top of the sand. Nothing bigger than 2 microns is going to get through.
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    Brentr's Avatar
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    Re: Need some clarification on using DE with a sand filter

    If sand catches particles bigger than 10 microns then anything smaller will filter thru it. DE particles is smaller than 10 microns so it would filter thru the sand. Does that make sense??
    6,000 gal, IG free form,Beach Series Antigua by Marbletite Pebble finish,Sheer Descent, IG Fountain, Dolphin / Mermaid Statues,Dura- Glas 1.5hp pump,Hayward Pro-grid DE4820, Aqua Rite SWG with T-Cell 15,Heat Siphon Heat Pump DX 5.0 109,000 btu, Pool Cage, 1800sq ft Tremron Estate Pavers,Aquatherm Ecosun Solar Panels 192 sq ft with GL-235 Controller,Pentair IntelliBrite, Apollo Magnetic Stirrer Our New Poolbuild, Jacksonville, FL yr 2009 Solar install Outdoor kitchen upgrade

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    Richard320's Avatar
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    Re: Need some clarification on using DE with a sand filter

    Quote Originally Posted by Brentr
    If sand catches particles bigger than 10 microns then anything smaller will filter thru it. DE particles is smaller than 10 microns so it would filter thru the sand. Does that make sense??
    No, DE particles are a lot bigger than 10 microns. You can see each individual speck of it with the naked eye, like flour. DE is not a tiny rock like sand. DE looks like a sponge under a microscope. The water goes through the particles, not through the gaps between them.
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    Brentr's Avatar
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    Re: Need some clarification on using DE with a sand filter

    Richard320, Diatomaceous earth (pron.: /ˌdaɪ.ətəˌmeɪʃəs ˈɜrθ/) also known as D.E., diatomite, or kieselgur/kieselguhr, is a naturally occurring, soft, siliceous sedimentary rock that is easily crumbled into a fine white to off-white powder. It has a particle size ranging from less than 3 micrometre to more than 1 millimeter. So if this true will the smaller particles less than 10 microns flow thru the sand filter? This seems to make sense to me. I welcome all opinions. Thanks in advance
    6,000 gal, IG free form,Beach Series Antigua by Marbletite Pebble finish,Sheer Descent, IG Fountain, Dolphin / Mermaid Statues,Dura- Glas 1.5hp pump,Hayward Pro-grid DE4820, Aqua Rite SWG with T-Cell 15,Heat Siphon Heat Pump DX 5.0 109,000 btu, Pool Cage, 1800sq ft Tremron Estate Pavers,Aquatherm Ecosun Solar Panels 192 sq ft with GL-235 Controller,Pentair IntelliBrite, Apollo Magnetic Stirrer Our New Poolbuild, Jacksonville, FL yr 2009 Solar install Outdoor kitchen upgrade

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    Re: Need some clarification on using DE with a sand filter

    So as a follow up to this...based on this concept doesn't the DE catch ALL the dirt and the sand simply does NOTHING ? Assume we would have to backwash a TON more using DE on top of SAND ?
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    JasonLion's Avatar
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    Re: Need some clarification on using DE with a sand filter

    Nothing catches all of the dirt, some stuff always gets through.

    When you add DE to a sand filter, you do need to backwash a little more often, but only a little.

    Adding DE to a sand filter is much better than sand alone, but not as good as a true DE filter. The DE does not form a solid layer across the entire sand bed, if it did the filter would stop working. DE filters have far more surface area than sand filters. The added DE catches only a small percentage of the finer particles on each pass through the filter, but over time as the water passes through the filter many times it will eventually get almost everything.
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    Re: Need some clarification on using DE with a sand filter

    Ah, ok...makes total sense.
    14,750 GAL IG Fiberglass (16 x 33) NE Ohio || Jandy 1HP 2 speed Pump || Waterco MultiCyclone 16 Centrifugal pre-filter (removed due to not working with sand filter) || 30" 575 Lb. Sand Filter || AquaCal 140K BTU Heat Pump || Solar Cover || Inter-fab Adrenaline Slide || GLI Monsoon Solar Cover Reel || K-2006C Test Kit || BBB with Liquid Chlorine Stenner Injection || Rayner Mighty Mesh Winter Cover

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