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Thread: New 4x160 pump question

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    Join Date
    Mar 2008
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    Florida
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    New 4x160 pump question

    Hello all, I have a 4x160 pump and wanted to know if this was a good way to go about finding flow rate.

    I used my pump to draw water from the pool and used the drain valve with hose to fill up a 5 gallon bucket. I checked to see how long it would take on the first 3 speeds. The thing i was wondering about was how can I compare a 2" flexible vinyl hose running say 20' versus my 2" sch 40 inground run going back to the pool (returns). Or is this method accurate enough to give me a way of determining runtime to cycle my water at least 1 turn daily.

    Thanks for any input!
    12-15k gallons capacity, 18'x34'
    2 main drains 4 returns 1 vacuum line
    pentair intelliflo 4x160 pump 200 sq ft media filter full width (~7' wide) swimout at deep end
    pebble sheen white diamonds

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,887

    Re: New 4x160 pump question

    There is no easy way to measure flow rate accurately unless you get a flow meter. Blue and White makes some flow meters that work well for under $100. Any kind of hose you attach is going to change the flow rate.

    Most of the time there is no real need to know the flow rate. You can usually adjust things based on how the water looks after a week of operation, though doing that sometimes gets tedious.
    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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    mas985's Avatar
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    Re: New 4x160 pump question

    As Jason pointed out, the most accurate method is with a flow meter. If you don't want to go that route, you can use the filter pressure and a vacuum measurement at the pump basket to determine total head and then look up the flow rate on the head curves. This is a little challenging for the Intelliflo since they don't show all of the RPM values but you can use this fitted curve approximation to determine the flow rate from head loss:

    GPM = 218 * sqrt ((RPM / 3450) ^ 2 - (Total Head loss / 96))

    If you don't want to get a vacuum guage, you can use and even rougher approximation of:

    Total Head = 3.5 * Filter PSI (assumes suction head is 50% of return head)

    That should get you pretty close.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    launboy's Avatar
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    Jun 2008
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    Re: New 4x160 pump question

    The way I did it was to hold a short (2 foot)piece of flexible hose against my return and let it flow into a 5 gal. bucket sitting next to the pool. I ended up wath 30 GPM which seems low for a 1HP pump although it was filtering and pushing the water 12 feet up to the roof for the solar. It also has to suck the water 30' to and from the pool.(2 inch PVC)

    Adam
    18' x 42" Intex Easyset Pool, with 16' x 52" deep end in the middle. Approx. 5500 Gal.
    Hayward Power-Flo LX 1 HP, 100# Jacuzzi Brand Sand Filter(Piped underground so it looks nice) 8)
    3 - 2' x 20' Solar Pool Heater Panels(roof mounted)
    Goin' on 9 summers...NOBODY thought it would last this long.
    Buried Portable Spa sharing pumps and water with pool (Almost complete project)

  5. Back To Top    #5

    Join Date
    Mar 2008
    Location
    Florida
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    81

    Re: New 4x160 pump question

    Awesome info guys, thanks for the 411. I will look into the math aspect as I believe I have a vac. gauge that I can try.
    12-15k gallons capacity, 18'x34'
    2 main drains 4 returns 1 vacuum line
    pentair intelliflo 4x160 pump 200 sq ft media filter full width (~7' wide) swimout at deep end
    pebble sheen white diamonds

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