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Thread: Use of DE in a sand filter

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    ChiknNutz's Avatar
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    Use of DE in a sand filter

    This is a really good thread as I have been in the same or similar situation this year. Since I have been doing BBB, never had a problem. This year, can't get the thing clear for love nor money. Now am looking to add the DE to my sand filter as well.

    Regarding the DE, do you have to add it after every backwash? I backwash frequently, a few times a week, so this may not be so good.


    Moderator note. This was split off this topic: Desperate -- pool party tomorrow. Cancel party? Floc? Yes, I HAVE BEEN SHOCKING! - Page 2
    Chris A.
    20x40 36k gal IG vinyl pool w/diving board & slide | 1.25HP Pentair Challenger motor & pump | 30" Triton TR100 sand filter | Pentair SM-20-3 multiport | Stenner 45MHP2 Peristaltic Pump & 13 gallon carboy (BBB) | Hayward CL200 Tablet Chlorinator (used on pool startup) | TF-100 | 2003 Sundance 850 Altamar hot tub

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    Mod Squad tim5055's Avatar
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    Re: Use of DE in a sand filter

    Why are you backwashing so often? You should only backwash when the pressure goes up 20-25%. If it is going up that much every week it may be time to deep clean the sand filter

    Here is the article with the details on Adding DE to a Sand Filter with all the details. But, to answer your question yes you would have to add it again every time you backwash as the DE gets backwashed out.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Mod Squad jblizzle's Avatar
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    Re: Use of DE in a sand filter

    You should only backwash when the pressure rises 20-25% over the clean pressure.
    You should not normally need to add DE, but if you are trying to remove the cloudiness toward the end of the SLAM process, then you can try it, and yes you would have to re-add it after every backwash.

    That thread is not really following the TFPC methods due to them trying to make the pool passable for a party ... clearly the last picture in it is no where near our high standards of crystal clear water.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    ChiknNutz's Avatar
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    Re: Use of DE in a sand filter

    My filter usually runs at about 16-18 PSI. I for sure backwash when I see it climb to 20 PSI or above. Often times I backwash even before I see it hit that. I dunno why I do it so often, maybe just overzealous on trying to keep up on it.

    FYI...I did do the Filter Deep Clean a week or so ago and honestly didn't see too much crud come out, but maybe that's because I do backwash a lot. Now granted I didn't spend hours doing the deep clean, but it just didn't seem necessary as there really wasn't much muck floating up. I also could not let it spill over nor could I remove the filter as it is in an enclosed pool house. All I did was run the hose until the filter was full, moving it around a lot, then sent it all to backwash (a couple times).

    In any case, thanks for the feedback.
    Chris A.
    20x40 36k gal IG vinyl pool w/diving board & slide | 1.25HP Pentair Challenger motor & pump | 30" Triton TR100 sand filter | Pentair SM-20-3 multiport | Stenner 45MHP2 Peristaltic Pump & 13 gallon carboy (BBB) | Hayward CL200 Tablet Chlorinator (used on pool startup) | TF-100 | 2003 Sundance 850 Altamar hot tub

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    Richard320's Avatar
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    Re: Use of DE in a sand filter

    Yes, you add DE after each backwash. However, since you'll only be using a few ounces at a time and it comes in 25 lb bags, the expense won't be too great when spread out over two or three years.

    Personally, I'd ask around and find someone with a DE pool and ask for an old margarine tub full of DE and try it before you invest in the whole bag.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    ChiknNutz's Avatar
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    Re: Use of DE in a sand filter

    Check this out. So I sent my wife to the only pool store in town to get some DE. They don't sell it. No idea why but they go on to tell her how I should not do this and that the sand needs to be replaced every 3 years. Seriously?! I would have thought better of this place as it is a one of and the guy has been around quite a while. They also seemed surprised when I was in there a couple years ago and I told them I used common bleach for chlorine. They also told yesterday her I need to use "different" bleach. Pfft.


    Chris A.
    20x40 36k gal IG vinyl pool w/diving board & slide | 1.25HP Pentair Challenger motor & pump | 30" Triton TR100 sand filter | Pentair SM-20-3 multiport | Stenner 45MHP2 Peristaltic Pump & 13 gallon carboy (BBB) | Hayward CL200 Tablet Chlorinator (used on pool startup) | TF-100 | 2003 Sundance 850 Altamar hot tub

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    Mod Squad jblizzle's Avatar
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    Re: Use of DE in a sand filter

    You should be able to get the pool DE at a hardware store or Walmart.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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