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Thread: Layer of thick spongy stuffing top of sand in filter

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    Layer of thick spongy stuffing top of sand in filter

    Cracked open the sand filter head and on top of the sand today I found this thick spongy stuff. I removed most of it by hand and have back washed several times about every 30 minutes today for about 3 hours. I've put algaecide in it and over shocked.
    There are still some smaller pieces of this stuff on the top of the sand.
    Is it time to replace the sand OR will this stuff die and get washed out as we progress?

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    Mod Squad jblizzle's Avatar
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    Re: Layer of thick spongy stuffing top of sand in filter

    Sounds like you need to: Deep Clean your Sand Filter

    There is rarely ever a need to replace sand.

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    Re: Layer of thick spongy stuffing top of sand in filter

    Thanks. I couldn't get the video to load but I will find it.
    Another question:
    Cya is still high (120-130 and it seems to vary). I vacuum to waste once a week and lose about 4 inches of water. I begin refilling after vacuuming about 1/3 of it.
    Is it a better practice to drain more and come back later to add? Or can I just wait until we get more activity and splash out as it gets warmer?



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    Mod Squad jblizzle's Avatar
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    Re: Layer of thick spongy stuffing top of sand in filter

    I would actively get the CYA down (but I do not know to what since I still do not have a location or know if you have SWG )
    Most efficient to do it all at once.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Layer of thick spongy stuffing top of sand in filter

    Jblizzle
    I'd like to hear more about what you mean about actively getting it down. Also, could you send me the link for an appropriate test kit given what I have below?

    I think I had two profiles out here when I reset my device.

    AG | 18x33 Oval | vinyl | 15k gallons | 1.5 hp sand filter | multi port | Wilsonville, AL | 4th summer this year


    AG | 18x33 Oval | vinyl | 15k gallons | 1.5 hp sand filter | multi port

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    Mod Squad jblizzle's Avatar
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    Re: Layer of thick spongy stuffing top of sand in filter

    I mean I would replace about 50% of the water at the same time instead of trying to do at 4 inches at a time. There is a link to the recommended test kits in my signature or there is a comparison table in pool school. Although you can't access those from within Tapatalk.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Layer of thick spongy stuffing top of sand in filter

    +1 what jblizzle said
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Layer of thick spongy stuffing top of sand in filter

    Quote Originally Posted by ScottG View Post
    I've put algaecide in it and over shocked.
    What do you mean by overshocked? Shock is a process and should start and end based on certain conditions, that's why we call it a SLAM (Shock Level And Maintain). You also added algaecide, why? Do you have algae forming or is it a preventative? What kind of algaecide is it?
    30'x52'' AGP 21,000 Gallons
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    Re: Layer of thick spongy stuffing top of sand in filter

    I got it taken care of now by getting the layer out and a modified version of the prescribed deep clean of the filter. Thanks for the help.


    AG | 18x33 Oval | vinyl | 15k gallons | 1.5 hp sand filter | multi port | installed summer 2016

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