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Thread: Green in little glass "jar"

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    jefeyessica's Avatar
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    May 2009
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    Green in little glass "jar"

    My pool looks great, and all my test levels are great. However, the little glass "jar" that is connected to the backwash gets dark green fairly quickly. I backwashed a week ago, and just added CYA a few days ago, so I can't backwash again for a few days. Why does that little glass jar get green so quickly ? And do you backwash as soon as it does? (mine starts turning green after only a day or 2)
    14,200 gallon in ground Plaster Pool
    "Titan Vertical Grid Filter" -- Pressure DE, 60 sq ft filter area

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    Re: Green in little glass "jar"

    Did you put the CYA directly into your skimmer, so it immediately went into the filter??

    If you put it in a sock, you CAN backwash.

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

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    JasonLion's Avatar
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    Re: Green in little glass "jar"

    It sounds like you are talking about the backwash sight glass. Water runs through that glass when you are backwashing so you can tell when you are done backwashing. The water will turn clear when you are done. When the system is left in filter mode, no water is running through there. Given some sunlight, algae could grow inside. That doesn't really matter, it will all get washed out the next time you backwash.

    You want to backwash when the filter pressure goes up by about 6 psi over the pressure when the filter is clean.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    AnnaK's Avatar
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    Re: Green in little glass "jar"

    Happens to my sight glass too. You can turn off the pump and unscrew the glass from the filter. Clean it, put it back on.
    — AnnaK —

    12,000 gal AGP, Hayward sand filter, Pentair 2-speed pump, timer.
    Please visit our Pool Issues pages for information about step weights, managing the solar cover, and PoolSkim.

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    jefeyessica's Avatar
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    Re: Green in little glass "jar"

    Thanks, it is the sightglass for backwash. As long as it's okay that there's algae in there, I won't worry about it.
    14,200 gallon in ground Plaster Pool
    "Titan Vertical Grid Filter" -- Pressure DE, 60 sq ft filter area

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    Re: Green in little glass "jar"

    Hate to tell you this but... if it gets greener as you start to backwash - you've got algae in the filter (and, unfortunately, it looks like it's alive and growing -- or this is your first backwash after cleaning up a pond of a pool) It may well be best to take the filter apart and hose it of thoroughly (every square inch of the grids!).

    If you haven't already please feel free to read Use and Care for DE Filters
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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    jefeyessica's Avatar
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    Re: Green in little glass "jar"

    We cleaned the filter about a month ago. After I backwash, the sightglass is clear, but after just a day or 2 the water in the sightglass starts to turn green. I think it's probably because it's sitting in the sun, and algae is just growing in the sightglass.
    14,200 gallon in ground Plaster Pool
    "Titan Vertical Grid Filter" -- Pressure DE, 60 sq ft filter area

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