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Thread: help with dual speed pump and pressure

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    help with dual speed pump and pressure

    Hi guys,

    I have a 20x40 IGP vinly pool finishing completion. I have the hayward dual speed super pump along with a DE filter. When the pump is in high speed my pressure is currently at 10 (just backwashed a day ago because of dirt in pool after rain and testing the backwash feature). When I switch the pump to low speed the pressure reading drops to 0 but water is still going through the filter as I can see debris moving in the pump strainer basket, skimmers as well as feel it coming out of the returns in the pool, although at a lower rate than when on high speed. My question is, should the pressure reading on the filter be at 0 when I switch the pump to low speed? The whole system has only been running for a week.

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    JasonLion's Avatar
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    Re: help with dual speed pump and pressure

    You are fine. Technically, the pressure shouldn't be zero. However that is not unexpected and actually fairly common. The inexpensive pressure gauges used on pool filters are not very good at measuring low pressures. The actual pressure is probably 1 or 2 psi, but the gauge simply can't read pressures that low.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: help with dual speed pump and pressure

    Wow, thanks for the fast repsonse. Would you recommend replacing the pressure gauage with one that is more accurate or call it close enough and be done with it?

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    JasonLion's Avatar
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    Re: help with dual speed pump and pressure

    I'd leave it alone. Turn the pump on high when you need to check the filter pressure.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: help with dual speed pump and pressure

    Leave it well enough alone. If you get a guage accurate enough to read the low pressure, it probably couldn't handle the high speed / high pressure readings. As long as you can see water flowing I wouldn't worry about it.
    16x32 IG 19,000 gallons, Pentair 1.5 hp Energy Efficient Superflo pump (348024),vinyl liner, Chlorine dispenser, Hayward S-244T sand filter

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    Re: help with dual speed pump and pressure

    when the pump is on it seems like the water in the skimmer closet to the pump (shallow end) is swirling more than the skimmer furthest from the pump (deep end). Is this to be expected since one is further from the pump?

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    Re: help with dual speed pump and pressure

    Yes, assuming 'one is farther' by more than a foot or two.

    If the skimmers are plumbed on separate 'home runs' back to your equipment pad, you can adjust the valves so that the flow is somewhat reduced on the closest skimmer so that its to equal the wide-open farthest skimmer.

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    Diver's Avatar
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    Re: help with dual speed pump and pressure

    on my pressure gauge, the needle rest is 1 psi, not zero. on low speed it hovers just above it, giving me a reading of 1.5 psi. mistakenly before i was thinking it was 0.5 psi
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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    Re: help with dual speed pump and pressure

    Diver, how long do you run your pump on low speed?

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    Diver's Avatar
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    Re: help with dual speed pump and pressure

    12 hours
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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