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Thread: Time of day to add bleach for proper FC maintenance...

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    Join Date
    Feb 2009
    Location
    College Station, Texas USA
    Posts
    32

    Time of day to add bleach for proper FC maintenance...

    I live near Houston, so it's getting warm and sunny down here.

    I have a 3 gpd Stenner pump with an electronic timer. I use liquid 8.25% bleach. I am having some difficulty maintaining a FC level that I consider acceptable. Water stays clear, but mustard algae (??) starts to form on the shady part of the pool.

    My chemistry:
    FC= 1.5ppm (I know this is low)
    CH= 200
    CYA= 50
    PH= 7.6
    TA= 90

    I've just added enough CYA to boost the CYA to 70, and bumped the calcium to get to closer to 300.

    The big issue is maintaining a high enough FC level. My question is about the injection times for the bleach. Currently, I do three 40-min intervals a day (about 10 oz of 8.25% bleach), at 8:00 am, 12:00 pm and 8:00 pm. I've just added two more of the same intervals at 1:00 am and 3:00 pm. So, beginning today, that is a total of 50 oz per day. As I was adding the new injection periods, I wondered about whether there is a strategy for WHEN to put in the bleach. Am I better off doing it all over night, and not in the middle of the day, or spreading it out like I do now, throughout the day and nite. The day-time injections may be sub-optimal, as it's the sunniest part of the day.

    So, what say you all?
    Location: College Station, Texas
    9K gal in-ground plaster pool
    Hayward ProGrid D.E. 2420 Filter
    Hayward Northstar Series 1HP Pump/Motor
    Stenner 3 GPD bleach pump and Pentair 320 Inline Chlorinator

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    TFP Guide

    cowboycasey's Avatar
    Join Date
    Jul 2013
    Location
    Fletcher, OK
    Posts
    3,346

    Re: Time of day to add bleach for proper FC maintenance...

    at 50 oz your adding 3.7 FC a day now and that is about right, I think because you have gone below 4 FC you have some algae taking hold, every time you go below that level things can grow.. the answer is more FC..

    go ahead and start a SLAM at your current CYA level, pass the OCLT, then take your CYA to 70 (basically a SWG pool level) and then always keep FC above 4, even if you have to use 60 oz or 70 oz per day, the goal is to keep fc above a certain level not use the least amount of bleach
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
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  3. Back To Top    #3

    Join Date
    Feb 2009
    Location
    College Station, Texas USA
    Posts
    32

    Re: Time of day to add bleach for proper FC maintenance...

    Thank you very much!!
    Location: College Station, Texas
    9K gal in-ground plaster pool
    Hayward ProGrid D.E. 2420 Filter
    Hayward Northstar Series 1HP Pump/Motor
    Stenner 3 GPD bleach pump and Pentair 320 Inline Chlorinator

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