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Thread: Filter pressure decreasing

  1. Back To Top    #1

    Join Date
    Apr 2016
    Location
    Houston, TX
    Posts
    63

    Filter pressure decreasing

    Hi folks,

    Just starting day 2 of new plaster startup. I had to backwash and recharge my DE filter 3 times yesterday due to 10 psi increases each time. The last time I backwashed was approx 12 hrs ago. Funny thing is that the pressure has actually gone down 2 psi since that last backwash (17 psi post backwash, currently 15 psi). I've been adding 24-32 floz of 31.45 muriatic acid at intervals at least 4 hrs apart to bring TA down from 130 ppm (currently at 110 ppm). I didn't want to spike pH by adding to much acid at once, hence the conservative rationing. Anyway, could the filter pressure drop be related to the addition of the acid I added this morning?

    Thanks

    IG, Plaster, 17,500 gal, Free-form (angular)
    Pentair FNSP 48 DE filter (48 sqft)
    Hayward SP3010X15AZ pump with 1.5 HP motor (installed 3/2015)
    Rock waterfall, large live oak shades half the pool
    Re-plastered April, 2017

  2. Back To Top    #2

    Join Date
    Apr 2017
    Location
    Californoa
    Posts
    25

    Re: Filter pressure decreasing

    Are you adding D.E. back into the skimmer? You need to recharge the grids each backwash with 2/3rds the capacity of your filter.


  3. Back To Top    #3

    Join Date
    Apr 2016
    Location
    Houston, TX
    Posts
    63

    Re: Filter pressure decreasing

    Yes

    IG, Plaster, 17,500 gal, Free-form (angular)
    Pentair FNSP 48 DE filter (48 sqft)
    Hayward SP3010X15AZ pump with 1.5 HP motor (installed 3/2015)
    Rock waterfall, large live oak shades half the pool
    Re-plastered April, 2017

  4. Back To Top    #4

    Join Date
    Apr 2017
    Location
    Californoa
    Posts
    25

    Re: Filter pressure decreasing

    Water is probably cleaner!


  5. Back To Top    #5

    Join Date
    Apr 2016
    Location
    Houston, TX
    Posts
    63

    Re: Filter pressure decreasing

    That's what I was hoping you'd say! Thanks

    IG, Plaster, 17,500 gal, Free-form (angular)
    Pentair FNSP 48 DE filter (48 sqft)
    Hayward SP3010X15AZ pump with 1.5 HP motor (installed 3/2015)
    Rock waterfall, large live oak shades half the pool
    Re-plastered April, 2017

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