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Thread: Adding DE to sand filter

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    astronaut888's Avatar
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    Adding DE to sand filter

    Been using TFPC with my pool for a few months now and have great results

    pH 7.5
    TC maintained between 4 and 8
    CC zero
    CYA 50
    TA 80

    Manually vacuum 2X weekly minimum and brush every other evening upon addition of that evening's bleach

    Have been noticing dirty areas in a few consistent spots for the past couple of weeks.
    I adjust the returns accordingly, however, still have dirty spots somewhere within about a day of vacuuming

    This has concerned me, however, from what I have read on the forum, a sand filter is not the best with regards to filtration and have chalked it up to just having a sand filter

    I remember a mention of adding a small bit of DE to a sand filter to increase filtration and was wondering if this, in fact, was a method that was accepted?
    Is there a thread already dedicated to this practice?

    Thanks in advance
    20K gal, IG vinyl, 1 1/2 HP Hayward Super Pump , 100lb sand, installed 2000 - new liner/filter/pump March 2014
    TF-100 test kit

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    JasonLion's Avatar
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    Re: Adding DE to sand filter

    There is an article in Pool School in the How To section on adding DE to a sand filter.

    However, your description is not normally a symptom of filtering problems. Stuff tends to accumulate on the bottom from blown in debris regardless of how good a filter you have. Dead algae can also accumulate on the bottom if there are periods when FC is just a little too low.
    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: Adding DE to sand filter

    I use Shock Booster from All Clear that It has polydimetyhldiallyammonium chloride and sodium bromide in it with sand filters, the first time I used it I freaked out thinking all the water was missing from one of my pools the next visit. The water was like glass and less than an ounce was needed (12,000 gal). It does oxidize out some chlorine but wow, cartridge filter clarity without the hassle of cleaning cartridges. I have had good luck with D.E. as well, especially if the filter has lost some efficiency.
    2013 20x40 Vinyl Ingound Pool. 30K Gallons. Hayward Aqua Rite Chlorine Generator. Hayward C-3030 Cartridge Filter. 1.5 HP Pentair Pump. Pentair Magic Stream II Deck Jets. Pool Automation=Allen-Bradley PLC 5/04. TF-100 Test Kit.

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    JasonLion's Avatar
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    Re: Adding DE to sand filter

    We do not recommend using Shock Booster from All Clear. It is completely possible to get perfect water clarity with any kind of filter and without problematic additives like that.
    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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    astronaut888's Avatar
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    Re: Adding DE to sand filter

    Quote Originally Posted by JasonLion View Post
    There is an article in Pool School in the How To section on adding DE to a sand filter.

    However, your description is not normally a symptom of filtering problems. Stuff tends to accumulate on the bottom from blown in debris regardless of how good a filter you have. Dead algae can also accumulate on the bottom if there are periods when FC is just a little too low.

    great, thanks
    quoting the write up "The very first time you do this, you should keep an eye on the filter pressure for the next 24 hours or so. The improved filtering may quickly catch a lot of very fine particles and send the filter pressure up rapidly."

    if this happens and I backwash, won't this backwash the DE out??
    20K gal, IG vinyl, 1 1/2 HP Hayward Super Pump , 100lb sand, installed 2000 - new liner/filter/pump March 2014
    TF-100 test kit

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    JasonLion's Avatar
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    Re: Adding DE to sand filter

    Yes, backwashing will remove the DE. You need to replace it each time after you backwash.
    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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    astronaut888's Avatar
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    Re: Adding DE to sand filter

    Quote Originally Posted by JasonLion View Post
    Yes, backwashing will remove the DE. You need to replace it each time after you backwash.

    gotcha!
    20K gal, IG vinyl, 1 1/2 HP Hayward Super Pump , 100lb sand, installed 2000 - new liner/filter/pump March 2014
    TF-100 test kit

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