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Thread: Another Closing Question...The Sand Filter

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    Join Date
    Aug 2016
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    HICKSVILLE, NY
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    Another Closing Question...The Sand Filter

    This will be the first time closing for me. I'll be using a Cyclone II Blower for this. I will be disconnecting the pump and blowing air directly into the PVC pipes. My plan is to bypass the sand filter by setting the valve to the "re-circulate" position prior to blowing the returns and the heater. My thinking on this is that it will lessen the possibility of blowing sand into the heater.

    My question is...Is this a legitimate concern? getting sand in the heater? Or would it be better to set the valve to "Filter" thereby including the filter in the loop while blowing the lines? Is there anything to be gained by blowing air into the filter? I HAD been under impression that leaving the air relief and drain caps open for a few days would be enough to drain ALL the water out of the filter.
    28,000 gallons, 18x36, vinyl liner
    Hayward C4030 Cartridge Filter, Hayward TriStar VS 900 Pump, Raypak 400 BTU gas heater,
    Stenner 45mhp10 Peristaltic Pump (for bleach injection)
    2 skimmers, 2 returns, main drain, Lamotte ColorQ and TF-100 test kits

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    Mod Squad JVTrain's Avatar
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    Feb 2014
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    Re: Another Closing Question...The Sand Filter

    Set the filter MPV to recirculate when blowing out lines. You only need to drain the filter by opening the valve/cap on the bottom of the filter itself and letting it drain completely. The filter will drain well once you put the MPV in the Winter position or in between two positions. I let my filter drain completely for several hours this way after or before blowing everything out, then put the cap back on. Even if there is a small amount of water in the bottom of the filter, it's below the laterals and will not cause any damage.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Aug 2016
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    HICKSVILLE, NY
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    Re: Another Closing Question...The Sand Filter

    Thank-you for that very clear explanation.
    28,000 gallons, 18x36, vinyl liner
    Hayward C4030 Cartridge Filter, Hayward TriStar VS 900 Pump, Raypak 400 BTU gas heater,
    Stenner 45mhp10 Peristaltic Pump (for bleach injection)
    2 skimmers, 2 returns, main drain, Lamotte ColorQ and TF-100 test kits

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    duraleigh's Avatar
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    Re: Another Closing Question...The Sand Filter

    Indeed, a great post, Joel.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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