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Thread: Does an over-sized filter increase water "turnover rate"?

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    Does an over-sized filter increase water "turnover rate"?

    Hi... narrowing this down,

    My system has a newer single-speed Hayward 1HP pump with 1.5" plumbing throughout. The old filter was a 36sf Purex DE stainless steel model from the 80s. If I move to a larger 48sf filter, will the turnover rate increase, thus allowing me to shorten my run times during the day?

    Thanks, Jon

    27k 16x32' IG
    30000 gal.
    Pentair 60 sq. ft. DE filter 150 gal. per min.
    IG 20X40 Free Form gunite/plaster
    2 hp Purex pump
    Corona, Ca.

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    Re: Does an over-sized filter increase water "turnover rate"?

    allowing me to shorten my run times during the day
    Not enough to be very noticeable. You will likely notice a drop on your pressure guage which means there is less resistance which means there is more water flow. However, the increased waterflow actually will allow your constant speed pump to do more "work" resulting in slightly more electrical consumption.

    None of these effects should be significant enough to make any real difference.

    The one effect you will probably notice is your water will be cleaner and you can go longer in between cleanings because of the increased filter capacity. Larger filters are always a good thing.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Does an over-sized filter increase water "turnover rate"?

    WRT to the size, larger is not always better with a DE or sand filter. If he had, for example, a 72 sq ft filter and a 1 HP pump, I doubt he would have enough flow to get a good back wash. If he had a cartridge filter, it would be a different story.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    Re: Does an over-sized filter increase water "turnover rate"?

    WRT to the size, larger is not always better with a DE or sand filter. If he had, for example, a 72 sq ft filter and a 1 HP pump, I doubt he would have enough flow to get a good back wash. If he had a cartridge filter, it would be a different story.
    It has been the consensus of this forum and others for years that a larger filter is better in almost every circumstance. Devising a scenario in which that may not be true adds unnecessary complexity to an otherwise fairly simple question.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Does an over-sized filter increase water "turnover rate"?

    Thank you for that information. I found a deal and went ahead and bought a Sta-Rite modular 48sf DE filter. This leads me to another question...

    Is there any way to "count" the amount of gallons being processed by the pump/filter system?... maybe as an inline product located within the PVC connections after the filter?

    Thanks,
    Jon
    30000 gal.
    Pentair 60 sq. ft. DE filter 150 gal. per min.
    IG 20X40 Free Form gunite/plaster
    2 hp Purex pump
    Corona, Ca.

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    Re: Does an over-sized filter increase water "turnover rate"?

    Quote Originally Posted by JWB
    Is there any way to "count" the amount of gallons being processed by the pump/filter system?...
    search on Blue-White flowmeter (the Blue-White part is a brand, there are other brands, that's just the one I can recall).
    Geometric 16X36', 16K gal, shotcrete, exposed aggregate plaster, acrylic coated concrete deck/cantilever coping;
    Pentair equipment suite (EasyTouch w/wireless, 2 Intellibrites, Intelliflo VS-3050, C&C 200 Filter, IC-40 SWG);
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    Re: Does an over-sized filter increase water "turnover rate"?

    Here's one place that has the best prices on flow meters I've found.

    Aqua Super Store Flow Meters

    Be sure to look at your requirements and order a vertical or horizontal as your piping runs dictate. Remember, close counts, so if you don't have the exact runs required close is good enough.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: Does an over-sized filter increase water "turnover rate"?

    As Bama points out, the placement of a flow meter is critical to accurate readings. If you don't have the room for the required straight piece of pipe, the readings can be significantly off.

    If you are just interested in a rough estimate as to flow rate, let me know the model number of the pump you have, filter PSI, ~ how long the runs are from the equipment pad to the pool and the number of runs for the suction and return lines. I can usually get fairly close with just that information and save you a bit of money on a flow meter.
    Mark
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    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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    Re: Does an over-sized filter increase water "turnover rate"?

    Hey thanks for the info and the offer.

    Raining here in SoCal. Will take some measurements and get back to you when it clears.

    Jon
    30000 gal.
    Pentair 60 sq. ft. DE filter 150 gal. per min.
    IG 20X40 Free Form gunite/plaster
    2 hp Purex pump
    Corona, Ca.

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