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Thread: Sand filter pressure

  1. Back To Top    #1

    Join Date
    May 2013
    Hartsville South Carolina

    Sand filter pressure

    Hey all, our pool was built in May. For the first few weeks I have back washed on Fridays after vacuuming through the skimmer. During the week I run a Hayward shark once or twice just to get the sand and dirt out. The pressure on the gauge is usually 18 when I backwash then 15 or so when im done. This week when I was done the pressure was at 18. Is this because the filter is new and is now getting some dirt in it or do you think I need to back wash again? I back washed for 2 or 3 minutes. The water turned clear. Then rinsed for 30 seconds. Any thoughts would be appreciated. Thanks, Ryan
    23k gal, IG, vinyl, Pentair sand filter, 1 hp single speed pump, pool pilot digital swg, Hayward sharkvac. Built May 2013

  2. Back To Top    #2

    Join Date
    Jun 2012

    Re: Sand filter pressure

    I was going to ask a very similar question this evening. I gradually "add" 1 psi every so often; I started out at 10-11 psi three months ago and now it sits closer to 15 psi. My question was going to be whether or not it was worth taking the multiport valve off of the filter and flush out the top of the filter with a water hose. I've scratched my head, and that's about all that I can come up with that makes sense. I'm sure it's a simple explanation.
    25,000 gal Plaster; Hayward 1 hp Super II; Hayward Vari-Flo XL Filter

  3. Back To Top    #3
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Sand filter pressure

    It sounds like you didn't backwash long enough. I'd backwash again and see what happens.
    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
    Pool School ----- Pool Math ----- TF-Test Kit

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