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Thread: Added DE to Sand Filter - Question/Observation

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    Added DE to Sand Filter - Question/Observation

    Ok, been using TFP for a long time (above ground pool) on my second year with my inground SWG pool (details in sig) no issues water is crystal clear.

    Pool has been open for a while, it was given a very detailed cleaning prior to adding DE to filter. I slowly added DE and ended up at the 1.5 cup mark for my 1lb of pressure rise. Water was very clean, floor spotless.

    It appears that the water may be slightly cleaner but I have also noticed that some extra dirt and other small trash on the bottom. It appears that adding the DE has somehow helped these things fall out of suspension as opposed to floating in the water. I may just be nuts or have some other cause for this to be happening but I do not know what it is. Is this normal or possible?

    Water looks fantastic BTW. I will post up some pictures later.

    Oh and just because I should...

    Temp 76
    FC 3.5
    CC .5
    PH 7.6
    CH 60
    TA 40 little low going to bring it up
    CYA 40 adding some now to bring it up to 55 to test next weekend
    Borates 20 or so, need to add to bring it back up
    Salt 3200

    Had a lot of dilution this winter and even more this spring.
    16,800 16'x32' IG Vinyl Pool, Buddy Seat, 7' Deep End
    Hayward Sand Filter(1.5 cups of DE), Pentair Pump, SWG Autopilot Digital
    Taylor K-2006 test kit, Speed stir, Borate and Salt Water Strips
    Polaris 9300 cleaner
    Pool Filled First Time June 14th, 2012
    Previous Pool AG Intex 16' Oval, SWG (5 Years)

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    linen's Avatar
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    Re: Added DE to Sand Filter - Question/Observation

    I would doubt it is adding the DE since that should stay in the filter if everything is working right.

    Definitely get your TA up to at least 60 ppm.
    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: Added DE to Sand Filter - Question/Observation

    I don't think it is DE, I know it is staying in the filter it just seems to me that it was stuff floating suspended in the water. It has filtered something out of the water as I had a pressure rise and had to backwash.
    16,800 16'x32' IG Vinyl Pool, Buddy Seat, 7' Deep End
    Hayward Sand Filter(1.5 cups of DE), Pentair Pump, SWG Autopilot Digital
    Taylor K-2006 test kit, Speed stir, Borate and Salt Water Strips
    Polaris 9300 cleaner
    Pool Filled First Time June 14th, 2012
    Previous Pool AG Intex 16' Oval, SWG (5 Years)

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    Richard320's Avatar
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    Re: Added DE to Sand Filter - Question/Observation

    Quote Originally Posted by bacpck
    I don't think it is DE, I know it is staying in the filter it just seems to me that it was stuff floating suspended in the water. It has filtered something out of the water as I had a pressure rise and had to backwash.
    [center:16t8eegt]Ah hah! We have a clue!


    I&#39;ll bet you didn&#39;t backwash long enough or rinse long enough and spit that stuff back into the pool.
    The only thing the DE did was force you to backwash sooner.[/center:16t8eegt]
    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Added DE to Sand Filter - Question/Observation

    Rofl great picture

    It was on the bottom prior to the backwash.. I had to pull 5 inches of water of the pool, I am fairly certain that I backwashed and rinsed it thoroughly.

    It is not a lot of stuff at all just seems to be a bit of extra dirt and stuff on the bottom. Now I did adjust my returns and it could be that it is just collecting differently on the bottom.


    16,800 16'x32' IG Vinyl Pool, Buddy Seat, 7' Deep End
    Hayward Sand Filter(1.5 cups of DE), Pentair Pump, SWG Autopilot Digital
    Taylor K-2006 test kit, Speed stir, Borate and Salt Water Strips
    Polaris 9300 cleaner
    Pool Filled First Time June 14th, 2012
    Previous Pool AG Intex 16' Oval, SWG (5 Years)

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    Mod Squad woodyp's Avatar
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    Re: Added DE to Sand Filter - Question/Observation

    Yep.........you're nuts! Different circulation pattern most likely.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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    Re: Added DE to Sand Filter - Question/Observation

    Pre DE... take some more tomorrow. . It looks as good if not better now.

    Attached Images Attached Images
    16,800 16'x32' IG Vinyl Pool, Buddy Seat, 7' Deep End
    Hayward Sand Filter(1.5 cups of DE), Pentair Pump, SWG Autopilot Digital
    Taylor K-2006 test kit, Speed stir, Borate and Salt Water Strips
    Polaris 9300 cleaner
    Pool Filled First Time June 14th, 2012
    Previous Pool AG Intex 16' Oval, SWG (5 Years)

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    Re: Added DE to Sand Filter - Question/Observation

    After DE


    Attached Images Attached Images
    16,800 16'x32' IG Vinyl Pool, Buddy Seat, 7' Deep End
    Hayward Sand Filter(1.5 cups of DE), Pentair Pump, SWG Autopilot Digital
    Taylor K-2006 test kit, Speed stir, Borate and Salt Water Strips
    Polaris 9300 cleaner
    Pool Filled First Time June 14th, 2012
    Previous Pool AG Intex 16' Oval, SWG (5 Years)

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    Re: Added DE to Sand Filter - Question/Observation

    I can't see any difference in the pics. Is it better after DE?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  10. Back To Top    #10

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    Re: Added DE to Sand Filter - Question/Observation

    I would think it is better. I can see very little difference in the water (as it was very clear to begin with). I do however think i can see the bottom better, the seam lines on the liner seem much more visible after the addition of the DE.

    I have been filtering something extra out of my water as I have had to backwash. I usually only backwash once a year, with the use of the cleaner that has its own basket I rarely get a pressure rise in my filter.
    16,800 16'x32' IG Vinyl Pool, Buddy Seat, 7' Deep End
    Hayward Sand Filter(1.5 cups of DE), Pentair Pump, SWG Autopilot Digital
    Taylor K-2006 test kit, Speed stir, Borate and Salt Water Strips
    Polaris 9300 cleaner
    Pool Filled First Time June 14th, 2012
    Previous Pool AG Intex 16' Oval, SWG (5 Years)

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    Re: Added DE to Sand Filter - Question/Observation

    I forgot to say that DE or not, your water looks terrific.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Richard320's Avatar
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    Re: Added DE to Sand Filter - Question/Observation

    Quote Originally Posted by bacpck
    I would think it is better. I can see very little difference in the water (as it was very clear to begin with). I do however think i can see the bottom better, the seam lines on the liner seem much more visible after the addition of the DE.

    I have been filtering something extra out of my water as I have had to backwash. I usually only backwash once a year, with the use of the cleaner that has its own basket I rarely get a pressure rise in my filter.
    The big test is at night, when the light picks out all the floaters for you to see.
    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  13. Back To Top    #13

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    Re: Added DE to Sand Filter - Question/Observation

    Quote Originally Posted by Richard320
    Quote Originally Posted by bacpck
    I would think it is better. I can see very little difference in the water (as it was very clear to begin with). I do however think i can see the bottom better, the seam lines on the liner seem much more visible after the addition of the DE.

    I have been filtering something extra out of my water as I have had to backwash. I usually only backwash once a year, with the use of the cleaner that has its own basket I rarely get a pressure rise in my filter.
    The big test is at night, when the light picks out all the floaters for you to see.

    Richard, I agree. I will throw the light on tonight and see what I get and thank you for the compliment.
    16,800 16'x32' IG Vinyl Pool, Buddy Seat, 7' Deep End
    Hayward Sand Filter(1.5 cups of DE), Pentair Pump, SWG Autopilot Digital
    Taylor K-2006 test kit, Speed stir, Borate and Salt Water Strips
    Polaris 9300 cleaner
    Pool Filled First Time June 14th, 2012
    Previous Pool AG Intex 16' Oval, SWG (5 Years)

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    harleysilo's Avatar
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    Re: Added DE to Sand Filter - Question/Observation

    LOL! Those pictures look terrible! You need to get a DE filter! Get that pool crystal clear....
    18'x43' Sport Pool
    19,000 Gallons Vinyl Liner 3'-3.5'-4'
    SWCG and D.E. Filter
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