Become a TFP Supporter Welcome to our new server and new forum software. Pool School
Results 1 to 12 of 12

Thread: bought a new pump now theres to much pressure.

  1. #1
    Junior Member
    Join Date
    Jun 2012
    Posts
    9

    bought a new pump now theres to much pressure.

    im new to this but we bought a used 21ft round pool got it all set up realized that the pump was bad so we bought a new one 1hp same as the one before it. we set everything up how it should be turn it on and for the first 5 mins its fine it runs quietly and everything seems right then all of a sudden you hear the pressure build up and the water coming out of the return starts moving so fast it makes the solar cover push to the other side or when my kids were inside the pool it was making all there toys float to the other side and stay there. we bought a pressure gauge for it and its not working so i know we have to replace that in the morning and the pump is off now. but i wanted to ask on here what would cause that kind of pressure build up i dont believe there are any clogs or anything everything was taken apart and put back together twice. the floaty thing in the skimmer doesn't really float it just gets stuck down and if i lift it up its like a toilet flushing if i hold it up after 5 mins or so bubbles start coming out of the return... sorry im such a newb
    Seafarer 32,500 gallons; Haywood (s244T)Sand filter; In ground, vinyl liner: 1 HP Haywood pump: Pool age approx 15 years

  2. #2
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
    Posts
    7,458

    Re: bought a new pump now theres to much pressure.

    It really sounds like everything is working right, but maybe the eyeball on the return needs to be aimed better. What kind of filter do you have.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  3. #3
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    20,689

    Re: bought a new pump now theres to much pressure.

    Were the old pump and new pump identical? Or just the 1HP part?

    There are service factors that could make two 1HP pumps VERY different. And a 1HP pump for above ground can be very different than a 1HP pump for an inground pool.

    Just wondering if this new pump is indeed more power than the old.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, Dolphin Diagnostic Robotic Cleaner, TF-100 test kit w/ SpeedStir
    Gone: Hayward RS1500 pump, undersized DIY solar heater, Dolphin Dynamic Robotic Cleaner
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  4. #4
    Junior Member
    Join Date
    Jun 2012
    Posts
    9

    Re: bought a new pump now theres to much pressure.

    Quote Originally Posted by JohnT
    It really sounds like everything is working right, but maybe the eyeball on the return needs to be aimed better. What kind of filter do you have.
    i believe the filter is a cyclone sand filter, my husband said when you try to point the return down it kind of helps but ive never been in someones pool where it shot out that fast.
    Seafarer 32,500 gallons; Haywood (s244T)Sand filter; In ground, vinyl liner: 1 HP Haywood pump: Pool age approx 15 years

  5. #5
    Junior Member
    Join Date
    Jun 2012
    Posts
    9

    Re: bought a new pump now theres to much pressure.

    Quote Originally Posted by jblizzle
    Were the old pump and new pump identical? Or just the 1HP part?

    There are service factors that could make two 1HP pumps VERY different. And a 1HP pump for above ground can be very different than a 1HP pump for an inground pool.

    Just wondering if this new pump is indeed more power than the old.
    the old pump we took to the pool store they told the motor was burnt out and showed us one that he said had all the same specs. the old one was a cyclone and the new one is a hayward sp1580
    Seafarer 32,500 gallons; Haywood (s244T)Sand filter; In ground, vinyl liner: 1 HP Haywood pump: Pool age approx 15 years

  6. #6
    Member
    Join Date
    Jun 2012
    Location
    Allentown, PA
    Posts
    95

    Re: bought a new pump now theres to much pressure.

    Hum, two things. From what you have said the filter might not be causing any backpressure on the motor and the pressure gauge might be fine. If that were true two things would occur:

    1) The output from the return would have a very high water flow and during high flow the pressure gauge reading would be very low (possibly even near zero)
    2) During low flow when the pump is first turned on the pressure gauge reading should be higher than in case 1 above.

    It could be because the sand filter is somehow being bypassed, sand is too low in the filter, channeling.... anyone else have any ideas?

    Both the pressure gauge and water flow are supporting that within 5 minutes there is no back pressure.

  7. #7
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
    Posts
    7,458

    Re: bought a new pump now theres to much pressure.

    Quote Originally Posted by jmborchers
    Hum, two things. From what you have said the filter might not be causing any backpressure on the motor and the pressure gauge might be fine. If that were true two things would occur:

    1) The output from the return would have a very high water flow and during high flow the pressure gauge reading would be very low (possibly even near zero)
    2) During low flow when the pump is first turned on the pressure gauge reading should be higher than in case 1 above.

    It could be because the sand filter is somehow being bypassed, sand is too low in the filter, channeling.... anyone else have any ideas?

    Both the pressure gauge and water flow are supporting that within 5 minutes there is no back pressure.
    Sounds like the right idea.

    What is the pressure gauge reading when you first start the pump and after a few minutes?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  8. #8
    Junior Member
    Join Date
    Jun 2012
    Posts
    9

    Re: bought a new pump now theres to much pressure.

    Quote Originally Posted by JohnT
    Quote Originally Posted by jmborchers
    Hum, two things. From what you have said the filter might not be causing any backpressure on the motor and the pressure gauge might be fine. If that were true two things would occur:

    1) The output from the return would have a very high water flow and during high flow the pressure gauge reading would be very low (possibly even near zero)
    2) During low flow when the pump is first turned on the pressure gauge reading should be higher than in case 1 above.

    It could be because the sand filter is somehow being bypassed, sand is too low in the filter, channeling.... anyone else have any ideas?

    Both the pressure gauge and water flow are supporting that within 5 minutes there is no back pressure.
    Sounds like the right idea.

    What is the pressure gauge reading when you first start the pump and after a few minutes?
    it reads nothing, im not sure it even works, its brand new but the needle has barely moved. im gonna try getting a new one today.
    Seafarer 32,500 gallons; Haywood (s244T)Sand filter; In ground, vinyl liner: 1 HP Haywood pump: Pool age approx 15 years

  9. #9
    Member
    Join Date
    Jun 2012
    Location
    Allentown, PA
    Posts
    95

    Re: bought a new pump now theres to much pressure.

    I doubt that the brand new gauge is bad. It's probably just indicating what appears to be wrong, no filter back pressure.

  10. #10
    Senior Member mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    6,252

    Re: bought a new pump now theres to much pressure.

    Quote Originally Posted by zamie22922
    the old pump we took to the pool store they told the motor was burnt out and showed us one that he said had all the same specs. the old one was a cyclone and the new one is a hayward sp1580
    Two different pumps, two different operating points. Just because the labels are the same does not mean they are the same. My guess is that your old pump was similar to the Intex pumps that come with many AG pools. The PowerFlo LX is much more powerful pump and will produce much higher flow rates.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study
    18'x36' 20k gallon plaster/gunite pool, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge Filter, 450 sq-ft EPDM Solar Panel, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  11. #11
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
    Posts
    7,458

    Re: bought a new pump now theres to much pressure.

    Double check that the handle on the filter is in the right position, then try holding your hand over the return to see if you get a pressure rise on the gauge.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  12. #12
    Junior Member
    Join Date
    Jun 2012
    Posts
    9

    Re: bought a new pump now theres to much pressure.

    bought a new pressure gauge and everything seems to be working ok, the pressure is at 12 and staying at 12 we backwashed the filter and rinsed it and that also seemed to help it. and we bought a new return eyeball that sorta faces down a little bit so that everything in the pool doesnt float to the other side including the solar cover. so far so good.
    Seafarer 32,500 gallons; Haywood (s244T)Sand filter; In ground, vinyl liner: 1 HP Haywood pump: Pool age approx 15 years

Posting Permissions

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