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Thread: Greenish tint & yellowish "debris" on bottom of pool

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    Join Date
    Jun 2012
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    Lafayette, Ca / USA
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    Greenish tint & yellowish "debris" on bottom of pool

    Background: We have a couple of large trees close to the pool & they have been dropping leaves since mid-October (and still going on). We put a LEAF NET over the pool mid-October with a blue Solar cover under that. We left it like that for about 4 weeks, not removing it as it continued to catch leaves. About 10 leaves made their way under the covers and into the pool bottom. We have been continuing to run the Filter (Cartridge) about 5-6 hours per day as well as the pool sweep (although not very efficient, obviously, seeing the leaves on the bottom). I'd been adding some Chlorine throughout these 4 weeks while covered (pool temp is down to around 60) to maintain FC 5.0 ..

    So we removed the net & solar cover to find a somewhat greenish tint to the water. There were some yellowish deposits visible on the steps (fiberglass/solid), so I brushed them - this resulted in some yellowish fine debris. That debris is all over the bottom - everywhere I brush. I've been running the pump/filter 6-8 hours per day now and brushing daily, but this stuff is still visible, although the water "seems" to look a little better.

    I checked my FC (7.0) and my CC (0.0) ... and have been brushing daily, with the same stuff being swept up. PH is around 7.3 - and I don't seem to be losing any FC.

    So, any idea what this is & do I need to SLAM it? Is this Yellow MUSTARD algae? I'm kind of surprised that with the FC level I tend to maintain that this could happen.

    Thanks in advance.
    30,000 Gal FIBER GLASS (over Gunite Plaster) Pool, Dolphin Nautilus PLUS Robot, (2) Cartridge Filter System (old), 1/2 HP Pump, Full Sun, Solar Heated, TF-100 Test Kit.

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    frustratedpoolmom's Avatar
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    May 2007
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    SWSuburban Chicago, IL
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    Re: Greenish tint & yellowish "debris" on bottom of pool

    What is your CYA level? From your description, could be Mustard Algae. How are you adding chlorine? Have you done an overnight test?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Greenish tint & yellowish "debris" on bottom of pool

    CYA is 30-35 ... I just rechecked my FC level & it is down to 4.0 (was 7.0 yesterday!) ... CC is still = 0.0

    Maybe time to SLAM this sucker?

    Thanks for the quick reply.
    30,000 Gal FIBER GLASS (over Gunite Plaster) Pool, Dolphin Nautilus PLUS Robot, (2) Cartridge Filter System (old), 1/2 HP Pump, Full Sun, Solar Heated, TF-100 Test Kit.

  4. Back To Top    #4

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    Lafayette, Ca / USA
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    Re: Greenish tint & yellowish "debris" on bottom of pool

    Also, so I'm clear, the Pool Calc suggests for a CYA of 35, the SHOCK=14 ... but then is also suggests for MUSTARD ALGAE, the SHOCK=22 !!! Not knowing if this is MUSTARD type algae, should I just assume it is NOT and go slow at first? I'd hate to damage the plumbing with too much CL ... and it's not too bad, yet ... I can still see the drains just fine, just regularly sweeping stuff off the steps & bottom of pool.
    30,000 Gal FIBER GLASS (over Gunite Plaster) Pool, Dolphin Nautilus PLUS Robot, (2) Cartridge Filter System (old), 1/2 HP Pump, Full Sun, Solar Heated, TF-100 Test Kit.

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    pwrstrk's Avatar
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    Greenish tint & yellowish "debris" on bottom of pool

    Any chance this could be pollen ?
    I would run an OCLT Test to see if you have organics consuming chlorine or not. If you pass the OCLT no need to SLAM. Also your CYA acts as a buffer for the chlorine to take away the harshness of it. So no worry's about the FC being to high at mustard shock level or regular shock level for the CYA level. 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Greenish tint & yellowish "debris" on bottom of pool

    Update: OK, first off, definitely NOT pollen. (Thanks though for that thought). I ran the OCLT the night before and it was definitely consuming Chlorine. So I just went ahead an SLAMMED it last night after bringing my PH down to 7.2. Brought it to a Shock level of FC=13 (for a CYA=35). Ran filter all night and checked again this morning: FC=12.5 , so good ...... water definitely looks less green to me today. (Maybe an illusion or just hopeful thinking ..lol). Anyway, I'll brush it down today a couple of times & continue my high(er) level CHLORINE for a couple of days. Hopefully I got on top of this early enough that it will clear fast.

    Thanks everyone for the support.
    30,000 Gal FIBER GLASS (over Gunite Plaster) Pool, Dolphin Nautilus PLUS Robot, (2) Cartridge Filter System (old), 1/2 HP Pump, Full Sun, Solar Heated, TF-100 Test Kit.

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    pwrstrk's Avatar
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    Re: Greenish tint & yellowish "debris" on bottom of pool

    It sounds like you caught it early. Good job !
    Your done when
    Water is crystal clear
    CC of 0.5 or less
    Pass the OCLT. 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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