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Thread: Backwashing DE (from a sand filter) Dangerous to Plants?

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    Backwashing DE (from a sand filter) Dangerous to Plants?

    I read up in pool school about how to add DE to my sand filter... but I've seen people mention that DE is hazardous to breath in and get on your skin, etc.

    My sand filter backwashes to the very front of my yard, so it flows directly to the side of the street. But where the water pops up, is right next to a series of bushes that separates my yard from the neighbors. Will these plants be poisoned if I'm backwashing DE near them?
    25x12, inground (pebble tech)
    1hp pump, Pentair Triton sand filter

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    Mod Squad Bama Rambler's Avatar
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    Re: Backwashing DE (from a sand filter) Dangerous to Plants?

    DE is an inhalation hazard so it won't hurt your plants. Also it's only listed as a probable hazard.
    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: Backwashing DE (from a sand filter) Dangerous to Plants?

    Sweet. Thanks for the quick reply!
    25x12, inground (pebble tech)
    1hp pump, Pentair Triton sand filter

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    linen's Avatar
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    Re: Backwashing DE (from a sand filter) Dangerous to Plants?

    Quote Originally Posted by Bama Rambler
    DE is an inhalation hazard so it won't hurt your plants. Also it's only listed as a probable hazard.
    So this brings up a question that I have wondered about...dumping it on your lawn, does it just sit there and if it does does it have a potential to be inhaled? I was going to try DE (more of a lark than a need), but this has made me hesitate.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Mod Squad Bama Rambler's Avatar
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    Re: Backwashing DE (from a sand filter) Dangerous to Plants?

    Each of us have our own level of comfort and what wouldn't bother me at all would, send someone else into conniptions. There's not enough DE that you backwash out to ever be a problem. Inhaled or otherwise.
    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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    linen's Avatar
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    Re: Backwashing DE (from a sand filter) Dangerous to Plants?

    Quote Originally Posted by Bama Rambler
    Each of us have our own level of comfort and what wouldn't bother me at all would, send someone else into conniptions. There's not enough DE that you backwash out to ever be a problem. Inhaled or otherwise.
    I had visions of a 1 foot pile of DE out in my yard that would dry and then get kicked up into the air..
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Backwashing DE (from a sand filter) Dangerous to Plants?

    It's been a few hours, and my filter pressure is holding strong at 22psi. I was kinda hoping adding the DE would immediately send my psi into the sky due to catching so much more debris.
    25x12, inground (pebble tech)
    1hp pump, Pentair Triton sand filter

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    Mod Squad Bama Rambler's Avatar
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    Re: Backwashing DE (from a sand filter) Dangerous to Plants?

    My experience mimics yours. Adding DE didn't make the pressure rise very fast at all.
    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: Backwashing DE (from a sand filter) Dangerous to Plants?

    Guess our pools are just better maintained then most others.

    25x12, inground (pebble tech)
    1hp pump, Pentair Triton sand filter

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