Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: Just replaced 350lbs of sand, 2nd day i noticed a pressure drop.

  1. Back To Top    #1

    Join Date
    Oct 2010
    Location
    michigan
    Posts
    283

    Just replaced 350lbs of sand, 2nd day i noticed a pressure drop.

    Just replaced 350lbs of sand. starting pressure 18PSi, checked couple hours later dropped to 15psi

    yesterday was 18psi to 16psi.

    can brand new sand end up channeling? or some other type of problem?


    none of the laterals where cracked, actually constructed very strong.
    15,000 gallon inground fiberglass pool with spa. 350lb Sand filter, 1.5 hp pump, and heater

  2. Back To Top    #2

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,081

    Re: Just replaced 350lbs of sand, 2nd day i noticed a pressure drop.

    I would chalk it up to a sloppy gauge or something perhaps unexplained. psi should never go down until you backwash or clean your filter.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3

    Join Date
    Oct 2010
    Location
    michigan
    Posts
    283

    Re: Just replaced 350lbs of sand, 2nd day i noticed a pressure drop.

    http://tftestkits.net/Pressure-Gauge...Mount-p77.html

    just bought this gauge, only a week old.

    guess I could try putting the old on in and see if it happens again.
    15,000 gallon inground fiberglass pool with spa. 350lb Sand filter, 1.5 hp pump, and heater

  4. Back To Top    #4
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Just replaced 350lbs of sand, 2nd day i noticed a pressure drop.

    Low presssure usually means a restriction or air on the suction side. It could be as simple as low water allowing a vortex in the skimmer.

    It's conceivable something happened inside the filter, but that usually shows up right away. I'd look for air leaks, clogged skimmer, clogged pump basket, a valve in the wrong position, easy stuff like that, first.
    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!

  5. Back To Top    #5

    Join Date
    Oct 2010
    Location
    michigan
    Posts
    283

    Re: Just replaced 350lbs of sand, 2nd day i noticed a pressure drop.

    its the gauge, I put the old gauge back in, 19psi, put the new one in again 16psi.

    will have to return it.
    15,000 gallon inground fiberglass pool with spa. 350lb Sand filter, 1.5 hp pump, and heater

  6. Back To Top    #6

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,081

    Re: Just replaced 350lbs of sand, 2nd day i noticed a pressure drop.

    Was it "pool sand" that you put back in the filter? If the sand was dirty, I suppose it could have been at a higher pressure initially and then forced some of the finest particles back into the pool but that is pretty doubtful. I'm gonna' think on that some more. I doubt it will happen again but that is interesting....keep us posted.

    It certainly couldn't be that VERY fine gauge you got.


    Check your PM's smooth2222
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  7. Back To Top    #7

    Join Date
    Oct 2010
    Location
    michigan
    Posts
    283

    Re: Just replaced 350lbs of sand, 2nd day i noticed a pressure drop.

    20140521_134229.jpghere is a picture of the gauges

    - - - Updated - - -

    new gauge on top, its getting worse. 14psi
    Attached Images Attached Images
    15,000 gallon inground fiberglass pool with spa. 350lb Sand filter, 1.5 hp pump, and heater

  8. Back To Top    #8

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,081

    Re: Just replaced 350lbs of sand, 2nd day i noticed a pressure drop.

    That is quite strange. The "dirty" sand idea I had is bogus......it would only drop once.

    I really believe that new psi gauge is accurate but I am (for now) at a loss to explain why your pressure is dropping.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •