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Thread: Best way to run sand with DE on start up?????

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    Best way to run sand with DE on start up?????

    Hi all,

    FC 13+
    alk 90
    cya 30
    ph 12 + ( I was told here its normal during shocking)

    I am in the final stages of pool clean up. Opened the pool and it was green. I am down to a cloudy pool.

    Here are my questions or concerns.

    When I backwash the filter I start at 12 PSI. I add about 1/2 cup DE and pressure rise is about a 1 psi. Then within 1 hour (possibly less) the psi gets up to 20 psi. Thats 8 psi higher. I should backwash and add more de and keep doing the same thing? I assume this is good since its collecting all the finer stuff that is making the pool cloundy?

    Now what I was thinking, because I need to reduce my electric usage, is add the de(possible 1/4 instead of 1/2 cup and run the pump on low speed. I figure low speed will filter better and save me alot in electric. 11 amps compared to 2.9 amps.

    I want the pool ready by Monday though but possibly low speed is better then high?

    Any thoughts?
    12X18 AG, 6200 gal
    Hayward S166T sand filter, Switched back to 100 sq ft cart.
    Hayward 1hp power flo matrix two speed pump.
    Been using BBB since pool was new in 2004. Never had any problems.

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    Re: Best way to run sand with DE on start up?????

    Does the pressure go up without the DE?
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    Re: Best way to run sand with DE on start up?????

    No the pressure does not go up as rapidly. Might take all day to get to 18 psi. Then it just seems to sit there. Thats why I think my pump may be pushing right through when it gets to a point. (Oversized for the filter) Not sure if that makes sense.

    Thats why I started addeing DE. The cloudy water is too fine for the sand alone to catch and I am wasting electric just running the pump on high alone.
    12X18 AG, 6200 gal
    Hayward S166T sand filter, Switched back to 100 sq ft cart.
    Hayward 1hp power flo matrix two speed pump.
    Been using BBB since pool was new in 2004. Never had any problems.

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    Re: Best way to run sand with DE on start up?????

    If you are getting that much pressure in one day, my opinion is to hold off on the DE until sand alone stabilizes and you just want to refine the water quality.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
    If TFP has helped you, please click to SUPPORT TFP!

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    Re: Best way to run sand with DE on start up?????

    Quote Originally Posted by RobbieH
    If you are getting that much pressure in one day, my opinion is to hold off on the DE until sand alone stabilizes and you just want to refine the water quality.
    What do you mean? If I have a cloudy pool and I go from 12psi to 18psi in one day without de is normal? Wouldnt the DE clean the pool faster? And how about low vs high speed?
    12X18 AG, 6200 gal
    Hayward S166T sand filter, Switched back to 100 sq ft cart.
    Hayward 1hp power flo matrix two speed pump.
    Been using BBB since pool was new in 2004. Never had any problems.

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    Re: Best way to run sand with DE on start up?????

    It seems uncommon to me to raise 6psi in one day unless your pool is extremely dirty. Maybe someone with direct experience with that exact filter can chime in. Mine goes weeks without creeping up but a few psi unless something's happened like a major pollen outbreak, having to shock the pool, etc.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
    If TFP has helped you, please click to SUPPORT TFP!

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    Re: Best way to run sand with DE on start up?????

    Yes thats what I stated above. Pool was just opened, and is cloudy. I want to clean it up fast, but use the least electric. I am not sure what to do regarding DE and high or low speed.
    12X18 AG, 6200 gal
    Hayward S166T sand filter, Switched back to 100 sq ft cart.
    Hayward 1hp power flo matrix two speed pump.
    Been using BBB since pool was new in 2004. Never had any problems.

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    JasonLion's Avatar
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    Re: Best way to run sand with DE on start up?????

    While the pool is obviously cloudy running on high speed will clean up the pool more quickly, because more water will pass through the filter. Once the water is almost perfect, running on low speed will do the best job because the filter catches more stuff on low speed, even though it takes longer to filter all the water.

    Adding just a little DE, as you have been doing, speeds things up, but it does mean more backwashing.

    RobbieH, the pool is cloudy with dead algae. There is plenty of stuff that can fill up the filter quickly. Things will be very different when the water is clear.
    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: Best way to run sand with DE on start up?????

    I dont mind backwashing a sand filter....LOL Its better then the cart I had.

    So the consensus is run at highspeed until clear, and adding DE will speed the process. Of course with possibly very frequent backwashing.

    And if I do the same on low speed it will take longer to clear up, even though it filters better? Yes I understand 80gpm highspeed vs 20 gpm low.
    12X18 AG, 6200 gal
    Hayward S166T sand filter, Switched back to 100 sq ft cart.
    Hayward 1hp power flo matrix two speed pump.
    Been using BBB since pool was new in 2004. Never had any problems.

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    Re: Best way to run sand with DE on start up?????

    Sounds like you got it. The reason I don't DE until I'm almost clear is because I don't like washing the DE out into my yard with the backwash after just a day's use. I'm a cheapskate
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
    If TFP has helped you, please click to SUPPORT TFP!

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    Re: Best way to run sand with DE on start up?????

    So the consensus is run at highspeed until clear, and adding DE will speed the process.
    I'm splitting fine hairs just a little but I wouldn't do the DE until your pool was virtually clear. The pump SHOULD be running 24/7 during this period and, if the pump plugs the DE laden sand and slows the flow all night, you will have lost ANY advantage in speed because your filter does not work when it is plugged.

    Either way will work but I believe it may clean faster in this case with sand alone.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Best way to run sand with DE on start up?????

    OK. Yes I seem to be having issues with DE. I am going to backwash later tonight and run on high all night. The pool just seems to be stuck at this white cloud stage. It does not seem to be clearing.

    I vacuumed just a few minutes ago, and did not backwash before I started. A light layer of slight foam, or suds appeared at the surface. Possibly the DE.
    12X18 AG, 6200 gal
    Hayward S166T sand filter, Switched back to 100 sq ft cart.
    Hayward 1hp power flo matrix two speed pump.
    Been using BBB since pool was new in 2004. Never had any problems.

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    Re: Best way to run sand with DE on start up?????

    I doubt the DE had anything to do with foaming.

    Tell me how you got that test result of 13+? How has your FC been over the last few days? Having to add a lot?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Best way to run sand with DE on start up?????

    I water the test down half tap half pool. 6200 gal I add 1 1/2 gall of bleach for about a 13 chloine. If its a 5 ppm I double and assume its a 10, and add half a gallon to bring back up to 13-14.

    I started Tuesday and went through about 18 gallons so far. $1.50 a gallon. Trying to keep level up.

    Alk is good at 90.

    PH Was real high. The pool did get down to a 5 FC and the PH tested at 7.2. But while shocking its up past 12.
    12X18 AG, 6200 gal
    Hayward S166T sand filter, Switched back to 100 sq ft cart.
    Hayward 1hp power flo matrix two speed pump.
    Been using BBB since pool was new in 2004. Never had any problems.

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    JasonLion's Avatar
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    Re: Best way to run sand with DE on start up?????

    The PH will read false high while the FC level is high.

    You need to use chlorine free water for dilution when doing a chlorine test. Most tap water has chlorine in it, though many people with wells don't have any chlorine. If you have any doubts, do the chlorine test on straight tap water to be sure it is chlorine free before using it for dilution.
    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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