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Thread: Yellow in the sight glass

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    Diver's Avatar
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    Yellow in the sight glass

    I haven't had a need to back wash my DE filter for over 2 months now and the sight glass on the multi-port grew all kinds of different things in there. It does have some distinct yellow spots:



    So, I'm curious if this shows that the area that I'm in have some mustard algae spores around? The pool is all good, it's just the sight glass.
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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    Mod Squad JVTrain's Avatar
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    Re: Yellow in the sight glass

    Yuck! I'd say you just have a algae bloom in the isolated vessel on the valve. Algae spores are everywhere and when that small vessel ran out of chlorine, somehow enough of the spores survived and went nuts. Whether it's mustard algae or not... hard to tell and I'm no botanist.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Mod Squad woodyp's Avatar
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    Re: Yellow in the sight glass

    I always empty out my sight glass after backwashing/rinsing and wipe it out.
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    Diver's Avatar
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    Re: Yellow in the sight glass

    i don't mind it being like that - it doesn't affect anything. as i mentioned in my original post i'm curious if this is an indication of yellow algae present in the area in general.
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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    Re: Yellow in the sight glass

    It's better to keep the glass clean so that you can observe the waste water.

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    Diver's Avatar
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    Re: Yellow in the sight glass

    it cleans up in an instant once i start back-washing.
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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    Re: Yellow in the sight glass

    Ive never taken out my sight glass in ?10 years?. Its still as clear as it was from day one. The filter is inside a well house type structure so direct sunlight is not striking it. That could be the factor.
    18,000 Gallon Aboveground. Sand Filter with 2HP 2 speed Pump.

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    Re: Yellow in the sight glass

    The waste line appears to be holding water. It might be a good idea to remove the sight glass after backwashing to allow the line to drain. Alternatively, you could install an inexpensive vacuum breaker to allow the line to drain. Example: The Oatey 1.5" cheater vent (Model 39012) would work.

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