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Thread: PSI up after adding DE

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    PSI up after adding DE

    I added 3/4 cup of DE to our sand filter today for the first time. The PSI started at 7 and went up one or two PSI after I added the last 1/4 cup, and now a couple hours later it's sitting at 14. I saw in the DE instructions that it could go up, but I'm wondering what do I do now that it has increased this much?
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

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    Mod Squad mknauss's Avatar
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    Re: PSI up after adding DE

    Back wash.
    6000 Gallon IG Fiberglass with integrated Spa
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    Marty

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    Re: PSI up after adding DE

    So then I lose the DE I just added?
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

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    Mod Squad mknauss's Avatar
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    Re: PSI up after adding DE

    Yes. When you add DE to a sand filter you are looking for a 1 psi or less rise. You added too much. Pool School - Add DE to a Sand Filter
    6000 Gallon IG Fiberglass with integrated Spa
    Pentair CCP240 Cartridge Filter with Pentair Intelliflow 3050VS Pump and Pentair HTR250 heater. IC40 SWG. EasyTouch 4. TF 100 Test Kit w/SpeedStir!
    CLICK HERE to Become a TroubleFreePool.com Supporter!!
    Marty

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    Re: PSI up after adding DE

    The DE you added did what DE does, it filtered out finer particles and in doing so raised the pressure. Backwash now and if you want to add DE, use less.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Re: PSI up after adding DE

    Ok, done. When I read "Add DE to a sand filter" I thought it said I would get close to two cups of DE before it was too much, so I guess I should have stopped at 1/4- 1/2 cup.
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

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    Re: PSI up after adding DE

    The amount depends on the size of the sand filter.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Richard320's Avatar
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    Re: PSI up after adding DE

    Proof that adding DE works. How long would it take to see that pressure rise normally?
    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: PSI up after adding DE

    It would normally take at least a week to go up that much. I added 1/4 cup yesterday and it handled it better. Still was up 2 psi by this morning so I backwashed again. I'm fighting an algae problem, and cloudiness, it did look a little better today. Been vacuuming and brushing every day for a week.
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

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    Mod Squad mknauss's Avatar
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    Re: PSI up after adding DE

    Algae is a chemistry problem, not a filtering problem. You most likely need to SLAM

    Take care.
    6000 Gallon IG Fiberglass with integrated Spa
    Pentair CCP240 Cartridge Filter with Pentair Intelliflow 3050VS Pump and Pentair HTR250 heater. IC40 SWG. EasyTouch 4. TF 100 Test Kit w/SpeedStir!
    CLICK HERE to Become a TroubleFreePool.com Supporter!!
    Marty

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    Richard320's Avatar
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    Re: PSI up after adding DE

    Yep, what he said ^^^ You'll never get to the end of the algae unless you kill it all with the Shock Level And Maintain Process.
    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!

  12. Back To Top    #12

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    Re: PSI up after adding DE

    Yeah, I just thought it might help with the cloudiness some. And I wanted to try the DE anyway.

    This is my first issue with algae. I've vacuumed and brushed every day for a week, I'll post test results, but they seem pretty stable to me. Every day when I vacuum, you can see a path where I've vacced and exactly where I haven't been. The first few days it looked like dust or some small particles billowing up on the pool bottom. Does this sound like algae?

    Do I need to slam?

    Yesterday's test results were :
    Chlorine 2.5
    PH 7.9
    CYA 30
    TA 60
    CC 0

    I adjusted with muriatic acid and chlorine
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

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    Mod Squad mknauss's Avatar
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    Re: PSI up after adding DE

    See Post #10. You have a chemistry problem, not a filtering problem. You need to SLAM
    6000 Gallon IG Fiberglass with integrated Spa
    Pentair CCP240 Cartridge Filter with Pentair Intelliflow 3050VS Pump and Pentair HTR250 heater. IC40 SWG. EasyTouch 4. TF 100 Test Kit w/SpeedStir!
    CLICK HERE to Become a TroubleFreePool.com Supporter!!
    Marty

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    Re: PSI up after adding DE

    I brought chlorine levels up to 15 last night. Vaccumed again this morning, and it looks much better, cloudy still, but blue! I figured out that I was off on my chlorine, a few ounces short each day.
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

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