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Thread: Need to add sand to filter?

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    Need to add sand to filter?

    I have a 19" Waterway sand filter, the kind that is spherical. The stand pipe is approximately 21" tall and the sand bed is 9" below the top of the stand pipe currently, so its filled just over half way with sand. Does anyone know how much sand should be in this filter? All of my research only shows sand total in weight. I basically need to know how full this filter should be with 100 lbs of sand in it.

    Also, I have a 1.5 HP single speed pump that was part of my filtering system when I moved in. My pool is only about 9000 gallons, and this pump seems to be too powerful for my pool (occasionally causes a vortex / whirlpool action in the skimmer basket which causes air bubbles to come out of the return). Should I think about replacing this pump?

    Thanks!
    21' round x 3' Vinyl AG 8300Gal, Waterway 1.5HP pump, Waterway 100# Sand filter

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    BoDarville's Avatar
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    Re: Need to add sand to filter?

    Quote Originally Posted by phipatch
    I have a 1.5 HP single speed pump that was part of my filtering system when I moved in. My pool is only about 9000 gallons, and this pump seems to be too powerful for my pool (occasionally causes a vortex / whirlpool action in the skimmer basket which causes air bubbles to come out of the return)
    Based on that information, I would agree with you that 1.5 HP is a bit much for a 9,000 pool. Not uncommon, since there is a tendency for installers to go with a higher HP pump than needed.

    Replacing it is your call. If it were me in that situation, assuming the current pump is a single-speed and running on 115 volts, I would replace it with a 1 HP 2-speed pump along the lines of this: http://www.amazon.com/2-Speed-volts-..._sim_sbs_lg_51
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
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    duraleigh's Avatar
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    Re: Need to add sand to filter?

    +1 what BoDarville said.

    I'll make a general statement and say most sand filter operate well being 2/3 full. 1/2 is not enough and 3/4 is likely too much.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Need to add sand to filter?

    Thanks for the link! Current pump is 115V. So I would use the low setting for normal filtration and circulation, and switch to high for vacuuming and backwashing, correct? Waterway's site shows the turnover through a 19" sand filter to be 16,000 gal in 6 hours at 45 GPM, but doesn't specify if thats on high or low setting. Assuming thats on high, would the low setting produce about half of that flow rate?
    21' round x 3' Vinyl AG 8300Gal, Waterway 1.5HP pump, Waterway 100# Sand filter

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    BoDarville's Avatar
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    Re: Need to add sand to filter?

    Quote Originally Posted by phipatch
    So I would use the low setting for normal filtration and circulation, and switch to high for vacuuming and backwashing, correct?
    Yes, that's correct.

    Quote Originally Posted by phipatch
    ...would the low setting produce about half of that flow rate
    Correct again. The other benefits of the low setting is that it will use much less electricity while providing better filtration.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

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