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Thread: water is crystal clear, but algae continues to form on walls

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    water is crystal clear, but algae continues to form on walls

    pool is a year old, inground gunite with white quartz finish. seems i have to brush about every other day to keep the light green algae off the walls, especially in shaded areas. it comes off fairly easy. water temp has been around 90. always keep my chemicals around 3-4 chlorine, ph 7.5ish, ta 80.

    is it somewhat normal for algae to grow on walls in the summer? thanks

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    Re: water is crystal clear, but algae continues to form on w

    Need a full set of numbers to tell you if your chlorine level is correct. Can you post a CYA number? How do you chlorinate the pool?

    Sounds like you need to read up on "How to shock your pool" in Pool School.
    pool-school/shocking_your_pool
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    Re: water is crystal clear, but algae continues to form on w

    cya around 60, ch about 300. i have been chlorinating lately with pucks but will prolly stop soon and switch back to bleach as the cya approaches 80.

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    Administrator Leebo's Avatar
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    Re: water is crystal clear, but algae continues to form on w

    Do you have a salt water generator?

    No algae is ever normal. How often do you fully brush the pool, walls and all? Also, at 60 cya your FC is a bit low. It maybe worth your time to boost it up some. I'd go 5fc at the lowest.

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    Re: water is crystal clear, but algae continues to form on w

    Your CYA should be around 40 for a normal pool, 70-80 for a salt water pool chlorinated by a salt water chlorine generator. The range for chlorine (FC) for a CYA of 60 is 5-9, which means you've been holding your FC too low. You almost certainly have to shock the pool at this point. Please note that shocking is a process, not a one-time addition of something you buy from the pool store.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    Re: water is crystal clear, but algae continues to form on w

    Quote Originally Posted by Leebo
    Do you have a salt water generator?

    No algae is ever normal. How often do you fully brush the pool, walls and all? Also, at 60 cya your FC is a bit low. It maybe worth your time to boost it up some. I'd go 5fc at the lowest.
    no, no swg. i really think if i had a slightly darker finish i would not be able to see it at all. water is clear, and it does not form on floor, just the walls especially in shaded areas. guess i'll shock it good and see if that helps.

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    Re: water is crystal clear, but algae continues to form on w

    Please see my notes above your last post. "Shocking it good" is a process, not a one-time addition.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    susa's Avatar
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    Re: water is crystal clear, but algae continues to form on w

    On a few family pools we solved this issue by running pump longer, in some instances 24 hrs, brushing daily and maintaining free chlorine high until walls clear

    Having swcg helps as it allows temporary elevation of performance and variable speed motor allows long runtime at low expense

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