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Thread: Alge in my filter

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    Join Date
    May 2013
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    Ottawa, On, Canada
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    Alge in my filter

    Usually I only need to clean my filter a couple times a year. This year i've had to do it every 2-3 weeks. Each time when I take the filter out it's coated in algae, but the pool itself is fine. I clean the filter put it back and shock the pool, but sure enough a few weeks later it's back. I've been checking my FC and it's always in the 3-5 range and as I said other than the filter the pool is looking good. Any suggestions?
    27' AG Round (~17000 Gallons or 64000 L)
    Hayward 1.5 HP Power Flo Matrix Pump (2 speed usually run 6hrs high 18hrs low)
    Hayward CC150CAN XStream Cartridge Filter (150 ft^2 120 GPM)
    Hayward AquaTrol SWG
    Installed April 2012

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    Texas Splash's Avatar
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    Re: Alge in my filter

    Hello! Well, I've had a similar experience in the past, and here's what I learned. Just because our water is clear doesn't mean something is wrong somewhere. I too would have to hose-out my filter everyday, sometimes 2-3 times per day hoping it would filter-out the algae. But it doesn't work that way. The reason algae finds that lovely, dark, cozy home is because it's just that - perfect for algae. Also, your chemical balance (chlorine compared to CYA/stabilizer) is probably not correct. When the chemical balance is correct, your filter will not have green in it.

    Best thing you can do for us right now it provide a full set of test results (FC, CC, CYA, TA, PH, and CH) via your Taylor K-2006 or K-2005 w/ FAS-DPD test. If you do not have one of those test kits, you must get one right away to provide and monitor the FC, CC, and CYA accurately and at higher levels needed. Let us know if you have any questions.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Join Date
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    Ottawa, On, Canada
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    Re: Alge in my filter

    Quote Originally Posted by Texas Splash View Post
    Hello! Well, I've had a similar experience in the past, and here's what I learned. Just because our water is clear doesn't mean something is wrong somewhere. I too would have to hose-out my filter everyday, sometimes 2-3 times per day hoping it would filter-out the algae. But it doesn't work that way. The reason algae finds that lovely, dark, cozy home is because it's just that - perfect for algae. Also, your chemical balance (chlorine compared to CYA/stabilizer) is probably not correct. When the chemical balance is correct, your filter will not have green in it.

    Best thing you can do for us right now it provide a full set of test results (FC, CC, CYA, TA, PH, and CH) via your Taylor K-2006 or K-2005 w/ FAS-DPD test. If you do not have one of those test kits, you must get one right away to provide and monitor the FC, CC, and CYA accurately and at higher levels needed. Let us know if you have any questions.
    So ya must have been algae. We had some swimmers in the pool today and by the time they got out the water had gone cloudy. I clean out the filter (etter to get the algae out of the pool than to kill it in the pool) and added the last bottle of 10% bleach I had on hand and cranked the SWG to 100%. Technically I need more than 1 bottle but with the SWG at 100% I'm hoping I'll be ok. Before I did al that though I checked me levels again

    FC 5
    CC <0.2
    CYA ~40
    TA 130
    PH 7.4
    CH (I didn't test but it's ok)

    My CYA is a bit low (The were OOS last time I was at the pool store ) but I didn't think it was low enough to cause a problem. Other than that everything else seems OK.
    27' AG Round (~17000 Gallons or 64000 L)
    Hayward 1.5 HP Power Flo Matrix Pump (2 speed usually run 6hrs high 18hrs low)
    Hayward CC150CAN XStream Cartridge Filter (150 ft^2 120 GPM)
    Hayward AquaTrol SWG
    Installed April 2012

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    Mod Squad tim5055's Avatar
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    May 2014
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    Columbia, SC
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    Re: Alge in my filter

    Running your SWG at 100% is going to do two things

    1. Shorten the life of your SWG

    2. Aggrivate the algae, but not kill it

    The SWG will not raise the FC high enough or fast enough to eradicate all the algae. The SWG is designed to maintain a sanitary pool, not clean up one that has algae.

    Turn off the SWG and SLAM your pool -

    Pool School - SLAM - Shock Level And Maintain
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Alge in my filter

    Quote Originally Posted by tim5055 View Post
    Running your SWG at 100% is going to do two things

    1. Shorten the life of your SWG

    2. Aggrivate the algae, but not kill it

    The SWG will not raise the FC high enough or fast enough to eradicate all the algae. The SWG is designed to maintain a sanitary pool, not clean up one that has algae.

    Turn off the SWG and SLAM your pool -

    Pool School - SLAM - Shock Level And Maintain
    I'm not just running the SWG at 100%, I also added 5 L of 10% liquid chlorine. By my calculations the chlorine should get me 80% to my shock target, and I'm just counting on the SWG to get me the other 20%. Then I keep the SWG at 100% for another day or two just to maintain the high level. I'd never run it at 100% for an extended period of time but it should be ok for a day or two. If it hadn't been 7pm when I got home and noticed the cloudy water I'd have gone out and bought another couple bottles of chlorine, but it was too late to get to any store. I'll check again in the morning and if my FC isn't up high enough I'll go buy another bottle but I have a feeling it will be.
    27' AG Round (~17000 Gallons or 64000 L)
    Hayward 1.5 HP Power Flo Matrix Pump (2 speed usually run 6hrs high 18hrs low)
    Hayward CC150CAN XStream Cartridge Filter (150 ft^2 120 GPM)
    Hayward AquaTrol SWG
    Installed April 2012

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    Mod Squad tim5055's Avatar
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    May 2014
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    Columbia, SC
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    Re: Alge in my filter

    But, you are still making it up as you go unless you are doing things you are not telling us. A SLAM is a complete process with several parts. It's not just raising the chlorine a couple of days.

    It's your pool and salt cell, but we do have aprocess that works.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Mod Squad kimkats's Avatar
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    Re: Alge in my filter

    If you are seeing algae in your filter you have algae in your pool. There is no way around it.

    Adding a gal or two every once in a while will not get rid of the algae. It is slowing it down but it is still there waiting.

    Have you seen this chart?

    Pool School - Chlorine / CYA Chart

    As you can see your FC should be 16. That means 16 ALL OF THE TIME. Do not go below 16 if at all possible until the SLAM is done.

    How do you know if your SLAM is done?

    -Clear water, no algae dirt on bottom of pool, and for you NO algae in the filter

    -CC less than .5

    -Pass the OCLT Pool School - Perform the Overnight FC Loss Test (OCLT)

    Have you done a OCLT? I wonder what that will show you?

    Good luck killing that algae.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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