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Thread: Sand Filter, should I Backwash

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    Sand Filter, should I Backwash

    I had a new pool installed about 1 1/2 months ago and normally use the BBB method but have been trying to increase CYA so recently added shock to the skimmer slowly and a little CYA I had left. I have been running the filter pump at night and off during the day normally. Recently the pump has increased pressure on the gauge to the "clean filter" mark and decreased output on return. Is it possible the shock and or CYA has not dissolved since I did not run 24/7 or maybe just needs a good cleaning. I would rather conserve the CYA in the filter but am concerned about the 1.5hp motor being under a load.
    13500 Gallon / BBB Method / TF100
    Pentair SD40 sand filter / 1.5hp Dynamo
    AG / Full Sun / Small Fountain
    Eastern NC, Moderate Rain

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    Join Date
    Dec 2007
    Location
    Central New York
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    504

    Re: Sand Filter, should I Backwash

    Most of the CYA should be gone and all the chlorine should be gone.


    But, a dirty filter is a dirty filter. You have to backwash.

    That's why alot of people use the sock method to add CYA.
    Hotrod30

    20 X 40 foot vinyl Borates and Salt Pool
    Rolachem Chlorine Feeder
    Hayward 27 inch sand filter with 80 lbs of pea gravel
    Jacuzzi Splash Pak SP55 DE filter in parallel
    Pentair VF3050 pump

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    Re: Sand Filter, should I Backwash

    Yeah, didn't realize it would bog it down at that rate.. Sounds like the sock method might be preferred for CYA. Thanks
    13500 Gallon / BBB Method / TF100
    Pentair SD40 sand filter / 1.5hp Dynamo
    AG / Full Sun / Small Fountain
    Eastern NC, Moderate Rain

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    Sebring, Florida
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    Re: Sand Filter, should I Backwash

    trying to increase CYA so recently added shock to the skimmer slowly and a little CYA I had left.
    How Recently?
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Sand Filter, should I Backwash

    Just added it although it was prob only 3/4lb of CYA. My pressure was running about 15 and now is at 20lb which is clean mark. I could run it awhile and see if it would dissolve some and reduce pressure but didn't want a burned out pump, not sure what the strain is on it but the return water flow is not near what it was.
    13500 Gallon / BBB Method / TF100
    Pentair SD40 sand filter / 1.5hp Dynamo
    AG / Full Sun / Small Fountain
    Eastern NC, Moderate Rain

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