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Thread: Green algae shooting out of return when vacuuming!

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    Onslow's Avatar
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    Jul 2010
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    Green algae shooting out of return when vacuuming!

    I've been tying to leaf rake as much as possible but since I can't see the bottom it's hit and miss with the size loads I fish out. I hooked my manual vacuum up to see what would happen and things went well for awhile. I would let the psi go from about 15 to 20 before backwash/rinse. Now the psi gets to about 18 and I start seeing a solid ray of algae shooting out the return!

    I quit vacuuming to filter and started filtering to rinse (I think it's rinse, I don't have a setting labeled "waste") which did really well at first but I don't like dropping the water level that quick. Have I blown up my filter? It seems to run fine in normal filter mode but now I'm concerned I'm just regurgitating algae back into the pool at a lower level where it's not visible.
    * 18' x 33' - 48" oval AGP - new liner Summer 2014
    * Hayward Pro Series S210T Top Mount Sand Filter
    * Hayward Power-Flo Matrix 1 1/2 hp Pump Model SP5615
    (equipment on posts prior to summer 2014) Hayward PowerFlo 1 hp pump - Jacuzzi "Tidewater" 190L, sand filter

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    Butterfly's Avatar
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    May 2007
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    Re: Green algae shooting out of return when vacuuming!

    When your turn off the pump, does the pressure gauge read zero?

    Gunk being returned to the pool sounds like you have some channelling.

    Here's some info: my-sand-is-channeled-how-to-fix-it-t7626.html
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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    Onslow's Avatar
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    Re: Green algae shooting out of return when vacuuming!

    Wow - I've not heard of this before! It has been an intensive cleaning this week trying to get a bunch of crud off the floor so this is definately worth a try. This makes me feel a lot better about broken/cracked lateral paranoia.

    I'll check about return to zero here in a bit.

    This morning I still can't see the floor but I am now up to a very bright blue compared to a dark blue with crud floating around yesterday.

    Thanks Butterfly!
    * 18' x 33' - 48" oval AGP - new liner Summer 2014
    * Hayward Pro Series S210T Top Mount Sand Filter
    * Hayward Power-Flo Matrix 1 1/2 hp Pump Model SP5615
    (equipment on posts prior to summer 2014) Hayward PowerFlo 1 hp pump - Jacuzzi "Tidewater" 190L, sand filter

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    Join Date
    May 2007
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    Re: Green algae shooting out of return when vacuuming!

    Use the waste setting. Keep the crud out of the filter.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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