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Thread: Looking for pump recommendation

  1. Back To Top    #1

    Join Date
    Jun 2014
    Location
    Southern, CA
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    14

    Looking for pump recommendation

    As I posted under SWG, I have a pool built in 2006 and I need to replumb things a bit to replace the SWG. The plumbing seems strange to me, for example the pipes to the pump are screwed directly into the pump so there's no way to remove the pump without cutting pipes. As I posted in the SWG thread, the company that built the pool disappeared before finishing. Since I have to mess with the piping anyway, this might be a good time to replace the pump.

    So my two main questions here are: (1) How much lifespan is likely left on the existing pump, and (2) could I really save money, long-term, by replacing the pump with something more efficient (and how "long-term" would that be)?

    Specs: 13k gallon inground pool with 3M's quartz finish, existing pump is Pentair WhisperFlo High Performance WFE-4 (1HP), Jandy AquaLink RS automation, SWG, DE filter, gas heater, cleaner is the 2-wheel "poolvergnuegen".

    The 2-inch pipe going into the pump comes from a manual valve which mixes two inputs: a 2-inch pipe from the skimmer (which in turn goes to 2 floor drains) and a 1.5-inch pipe that goes to the cleaner port. Normally what I do after backwashing the DE filter is set that manual valve all the way selecting the skimmer, and then slowly turn it towards selecting the cleaner until bubbles start to appear in the pump's basket. Then I back it off a little to eliminate the bubbles. That setting seems to work fine for the cleaner.

    Typically we run the pump 5 hours a day. Pentair says the pump draws 7.4A at max load at 230V, which would be 1700 watts. Given that electricity here costs 25 cents per kWhr, that comes to $776/year in electricity. I have no clue whatsoever how many gallons per minute the pump is doing, so I have no idea how many changes/day running the pump 5 hours comes to.

    The specs for the filter show no minimum GPM, the SWG 20 GPM min, the heater 40 GPM min. For maximums, the filter says 145 GPM, the SWG doesn't say, and the heater says 120 GPM. If for some reason I had to replace the SWG with the newest model (AquaPure Ei), it has a maximum of 92 GPM.

    If I were somehow able to set a new pump for 40 GPM, that would meet the minimums for everything except perhaps the pool cleaner, and do almost 1 change per day at 5 hours per day. If that wouldn't be enough for the cleaner, conceivably I could program the AquaLink to run the pump at a different speed for the cleaner?

    The Jandy variable-speed pumps are of course compatible with Jandy's AquaLink RS, and according to the AquaLink manual so are Pentair pumps (or maybe just IntelliFlo?).

    Any recommendation for brands/models of pumps, whether to replace the pump or not, and tips on using variable pumps would be appreciated!

  2. Back To Top    #2
    mas985's Avatar
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    May 2007
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    Pleasanton, CA
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    Re: Looking for pump recommendation

    The wet end of the pump can last for decades. It is usually the motor that fails but that is easily replaced too. But given the way the pump was installed, I am not sure if it is serviceable. Have you ever removed the motor from the wet end?

    With higher electrical rates, a VS makes more sense. You might want to check into any rebate programs from the power company. But I sure don't envy the one that replaces the pump.
    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
    Jun 2014
    Location
    Southern, CA
    Posts
    14

    Re: Looking for pump recommendation

    mas985, I have not done anything with the pump other than clean the basket as needed. It looks like maybe one could remove the motor, but one would probably have to remove the pipe that runs from the heater output to the SWG to get enough room (which can be done, since there's unions at each end).

    The power company does have a $200 rebate on the Jandy VS-FHP2.0 and several Pentair models. Looking at the variable-speed pumps, though, they all seem to have a control panel mounted on the top of the motor. The two pipes coming out of the heater are very close to the top of the existing motor, so I doubt anything with a control panel on top would work... unless I were to raise the heater up. Not sure how feasible that is.

    Replacing the pump clearly would be a big project... it would help to know how much I could realistically expect to save with a new pump. Most of the "estimated savings" I see for pumps are obviously ridiculous (they say I'd save more per year than I'm paying!). It seems to me that in order to calculate the savings, one must know the "total head" of the existing plumbing, or how many GPM it is pumping, or the level of vacuum on the suction side... something with which to calculate what speed to use on a variable-speed pump!

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

    Re: Looking for pump recommendation

    The following should give you a rough idea just multiply the numbers by 2.5. You can download the SS in my signature if you want to play around with different scenarios and change the energy cost.

    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

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