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Thread: Sight glass question

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    Join Date
    Jun 2009
    Location
    Columbia, SC
    Posts
    20

    Sight glass question

    The only time I see water in my sight glass is when I backwash. Isn't the water supposed to be visible when the filter is operating in the regular mode. As a possibly related issue the PSI on my gauge isn't creeping up. Any info would be appreciated.
    20K gal, vinyl, 3/4 HP pump, Hayward sand filter

  2. Back To Top    #2

    Join Date
    Feb 2010
    Location
    Houston, TX
    Posts
    271

    Re: Sight glass question

    I think the only time you should see water in the sight glass is when you backwash. Someone correct me if I'm wrong, it wouldn't surprise me.

    Some people on here have noted they don't see a gradual increase in pressure, it just happens quickly when it does rise. Or, you could also need a new gauge. If you haven't replaced it in a year or two, you could just get a new one. They're cheap, so if in doubt, replace it.
    John

    24' round Vogue AGP 12,000 gal. Flotec AT251001-01 1HP pump, Hayward S310T2 sand filter, Aquarite SWG T-15
    TF-100 (found at TF Test Kits) with Speedstir and Samplesizer

  3. Back To Top    #3

    Join Date
    Dec 2009
    Location
    Central Massachusetts
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    2,677

    Re: Sight glass question

    Quote Originally Posted by cheddar85

    I think the only time you should see water in the sight glass is when you backwash. .
    Correct
    14,000 gallon IG, Vinyl. Hayward 3/4 hp superpump, Penatair IC40 SWCG, Pentair automation, Hayward sand filter, Aqua Comfort heat pump, Hayward 400k Lo-Nox LP heater.

  4. Back To Top    #4
    Mod Squad Bama Rambler's Avatar
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    Jun 2009
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    SouthWest Alabama
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    21,774

    Re: Sight glass question

    Water should only be visible in the sight glass when backwashing. If you see it in there any other time it either means the multiport valve is leaking or the backwash drain line isn't draining properly.
    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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