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Thread: Is my pump too small?

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    Join Date
    Jan 2015
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    Orlando
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    Is my pump too small?

    Builder just finished our pool 10 days ago. I'm disappointed in the amount of flow we are getting from our spa into the pool. We have 4 returns in the pool and one in the spa. We have a Hayward C-1750 cartridge filter and a Hayward heat pump. The pump is a Hayward Max Flo VS 1.5 hp. At the max 3,000 rpm I get enough flow to circulate the water in the pool, but the spillover of the spa is very minimal. It is basically a trickle. My filter is clean and I am not running any of the other water features. Any advice? Do I need a bigger pump? I am contemplating replacing the Max Flo to the Ecostar 3400 VSP. I want to be able to run my 24" waterfall, sundeck fountain and have flow over the spa all at the same time. Is this possible?

    Thanks.
    12,000 gal, 1/20/15 install, IG, Plaster, Cartridge Hayward C-1750, Hayward Max Flo 2303 VSP, 4 jets spa, SWG, Waterfall, Fountain, Hayward Heat Pump, Hayward ECommand 4, Orlando FL.

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    mas985's Avatar
    Join Date
    May 2007
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    Pleasanton, CA
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    Re: Is my pump too small?

    A MaxFlo is a low head pump and is very efficient but it is not well suited for spa jets. Have you tried the jets yet? How many jets do you have?

    The EcoStar is a better choice for a dual application pool/spa setup.
    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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    Orlando
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    Re: Is my pump too small?

    Thanks for the information.

    We have 4 jets in the spa. In spa mode, there seems to be a decent amount of flow, but the pool builder did not put eyeballs in the jets yet. Basically I have about 1 1/4" openings on the spa jets since there are no eyeballs installed yet. What do you recommend for the orifice size for the spa eyeball jets (3/8, 1/2, 3/4")? The spa has 4 jets, its circular and is about 6' in diameter. The spa return has an eyeball installed and it is 3/4".
    12,000 gal, 1/20/15 install, IG, Plaster, Cartridge Hayward C-1750, Hayward Max Flo 2303 VSP, 4 jets spa, SWG, Waterfall, Fountain, Hayward Heat Pump, Hayward ECommand 4, Orlando FL.

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    mas985's Avatar
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    May 2007
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    Pleasanton, CA
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    11,490

    Re: Is my pump too small?

    So is it the single eyeball that is feeding the spillover mode? If so, you might try changing that to 1" and see if that helps the spillover. What size pipe did the builder use for that?

    BTW, what is the filter pressure in spillover mode & spa mode?

    As for jet nozzle size (not eyeballs), there are a couple of considerations. What pipe size did the builder use and what is the distance from the pump to the spa?
    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

  5. Back To Top    #5

    Join Date
    Nov 2013
    Location
    Fort Worth, TX
    Posts
    112

    Re: Is my pump too small?

    Have you tried adjusting your valves? Run more flow into the spa and less into the pool. This will increase the flow from your spa into your pool.
    30,000 plaster in-ground pool with spa; 2.5HP single speed Centurion pump; Raypak RP2100 propane heater; Polaris 280 with pump, waterfall with separate pump, Triton II commercial sand filter; TF-100 test kit w/ SpeedStir

  6. Back To Top    #6

    Join Date
    Jan 2015
    Location
    Orlando
    Posts
    3

    Re: Is my pump too small?

    The PB is replacing the pump with the larger Ecostar (for a premium). He says the Max Flo is not large enough for our pool setup. Thanks for the responses.
    12,000 gal, 1/20/15 install, IG, Plaster, Cartridge Hayward C-1750, Hayward Max Flo 2303 VSP, 4 jets spa, SWG, Waterfall, Fountain, Hayward Heat Pump, Hayward ECommand 4, Orlando FL.

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