Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: Pool pump replacement blues

  1. Back To Top    #1

    Join Date
    Sep 2009
    Location
    Burleson, TX
    Posts
    21

    Pool pump replacement blues

    Hi all, I've got a 15k gallon above ground pool with a saltwater chlorinator and a robot sweeper. My pump, a Power-flo Matrix 1hp 2 speed gave up the ghost today. I was shopping around and gleaning all the information I could about pump technology and was pretty interested in the variable speed pumps. Then I realized that they really don't make those for above ground pools. So then I started looking at 2 speed pumps, but I realized, for the last couple of years, I never moved off of the low speed and ran it 24/7. I don't ever vacuum and my robot is electrical. Additionally, I always wished there was a speed in-between the high and low settings as high seems to be a little much for my EC50AC DE filter and low was just a tad too slow for the chlorinator when the filter was needing bumped.

    Would it be a crazy idea to go to single speed 3/4 HP pump and run it 24/7?

  2. Back To Top    #2
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,487

    Re: Pool pump replacement blues

    A 1 HP pump run at 1/2 speed is theoretically a 1/8th HP pump (affinity laws). Also, a 3/4 HP is not much different than a 1 HP in terms of energy consumption. So you are looking at about 10% reduction in power. Where as low speed of the 1 HP is about 75% lower in power so a significant savings. Even if you run on low speed all the time, you would probably be better off getting another 2 speed motor.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  3. Back To Top    #3

    Join Date
    Sep 2009
    Location
    Burleson, TX
    Posts
    21

    Re: Pool pump replacement blues

    so maybe go up to a 1.5 hp to get a little more strength to the low speed?

  4. Back To Top    #4
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,487

    Re: Pool pump replacement blues

    On typical AG plumbing, the 1.5 HP delivers only 1 GPM more than the 1 HP on full speed. Low speed is only 0.5 GPM. So probably not worth it.

    There might be some other things you could do to increase flow. How many return lines does the pool have and what size eyeballs are entering the pool. Describe suction side too. Also what kind of swg do you have?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

Posting Permissions

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