Become a TFP Supporter Welcome to our new server and new forum software. Pool School
Results 1 to 5 of 5

Thread: Loss of suction

  1. #1
    Junior Member
    Join Date
    Apr 2009
    Posts
    15

    Loss of suction

    I have an old in ground pool, probably built in the 50's. I installed a Pentair whisperflo 2 speed pump last year and everything went pretty smooth. I also have a 48 sq. ft. DE filter with new grids. All of the original lines appear to be 1 1/2".

    Everything was running normal last week, I did have a couple of small leaks but I took care of them. Here's the problem, when I start the pump everything is fine for about 10 seconds and then it will lose suction then it will build pressure and then lose it. This cycle will continue over and over. Again, no discernible leaks, filter is clean and the water coming into the pump is clear (no dirt).

    Does anybody have any suggestions?

    Thanks,

    Trace
    19,600 to 22,500 gallon plaster pool. (Every calculator is different)
    1 1/2 hp pump Don't know the flow rate
    48 sq. ft. DE filter
    Polaris 280
    Real POS Laars LX Low NOX 400k heater (5 years old and it's DEAD)

  2. #2
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
    Posts
    7,633

    Re: Loss of suction

    Check that the water level is high enough in the skimmer and that the skimmer door swings up and down freely.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  3. #3
    Junior Member
    Join Date
    Apr 2009
    Posts
    15

    Re: Loss of suction

    Thanks for your quick response, the water level is high enough so that the skimmer door swings freely.

    Anything else to check?

    Trace
    19,600 to 22,500 gallon plaster pool. (Every calculator is different)
    1 1/2 hp pump Don't know the flow rate
    48 sq. ft. DE filter
    Polaris 280
    Real POS Laars LX Low NOX 400k heater (5 years old and it's DEAD)

  4. #4
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    20,917

    Re: Loss of suction

    Are you seeing air in the pump basket? Sounds like you have a suction leak somewhere. Start by checking the pump basket lid. Make sure the o-ring is lubed. From there it's a matter of checking the suction piping from the pool to the pump.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  5. #5
    Junior Member
    Join Date
    Apr 2009
    Posts
    15

    Re: Loss of suction

    Got it fixed. The skimmer door was hanging and blocking some of the water from entering the return. I feel like a newbie, maybe because it's the beginning of the season.

    Thanks for everyones help.

    Trace
    19,600 to 22,500 gallon plaster pool. (Every calculator is different)
    1 1/2 hp pump Don't know the flow rate
    48 sq. ft. DE filter
    Polaris 280
    Real POS Laars LX Low NOX 400k heater (5 years old and it's DEAD)

Posting Permissions

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