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Thread: Despite 90-100 degree Texas heat my chlorine levels are...

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    Despite 90-100 degree Texas heat my chlorine levels are...

    Despite 90-100 degree Texas heat my chlorine levels are rising each week. It was at 7 last week and now it's at almost 9, and I've turned down the setting on my inline trichlor thing. I know trichlor isn't the way to go, and I plan to put in an SWG system next year, but for now I'm dealing with trichlor

    Here are the stats...

    FC - 8.5-9
    pH - 7.6
    TA - 90
    CH - 250
    CYA - 65-70
    Water Temp - 82 degrees

    Any ideas as to why it is continuing to rise?

    Thanks for your help!
    15k in-ground pool and spa || Dark Blue PebbleSheen Finish || Pentair DE Filter || Pentair VS+SVRS Pump

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    duraleigh's Avatar
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    Re: Despite 90-100 degree Texas heat my chlorine levels are.

    turn your chlorinator down some more. Simply put, you are adding more chlorine than you are consuming.

    Can't tell you why but the fix is simple.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Mod Squad jblizzle's Avatar
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    Re: Despite 90-100 degree Texas heat my chlorine levels are.

    Because you are adding more FC than needed. And as the CYA rises the FC is better protected from the sun.

    You should really stop using the pucks immediately, your CYA is already higher than we would recommend ... at least the FC is high enough such that you should not develop algae ... yet.

    Keep the FC above the minimum listed in the CYA/FC chart and you should be fine, but eventually the pucks will not be adding enough FC to overcome the stabilization as the CYA keep rising.

    Right now 5ppm is the minimum you should let the FC get.
    pool-school/chlorine_cya_chart_shock
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    Re: Despite 90-100 degree Texas heat my chlorine levels are.

    That was my initial thought as well - my CYA was fairly high so it's not burning off as fast as it was a few months ago. In the next week or so I'm going to do a partial drain to get it back down to a more reasonable number. Speaking of draining, is it best to do it all at once, or would it make more sense to do it in two 25% increments (I was planning on doing a 50% change).
    15k in-ground pool and spa || Dark Blue PebbleSheen Finish || Pentair DE Filter || Pentair VS+SVRS Pump

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    Mod Squad jblizzle's Avatar
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    Re: Despite 90-100 degree Texas heat my chlorine levels are.

    Generally all at once is faster, if you are able to without structural integrity worries.

    Two 25% drains would only drop the CYA by 44% (.75*.75) where one 50% drain would lower it by 50%.
    Jason, TFP Moderator
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    Re: Despite 90-100 degree Texas heat my chlorine levels are.

    That's a good point.

    What kind of structural integrity issues should I be concerned about? The pool is about eight months old, gunite construction with a pebbletec finish. I was thinking about just using the backwash port on my multiport and then throwing a couple hoses in the pool to fill it back up.
    15k in-ground pool and spa || Dark Blue PebbleSheen Finish || Pentair DE Filter || Pentair VS+SVRS Pump

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    Mod Squad jblizzle's Avatar
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    Re: Despite 90-100 degree Texas heat my chlorine levels are.

    Floating the pool out of the ground if you have high ground water table. Certainly not a problem here since the water table is measured in 100s of feet

    Also not usually a good idea to run all that water backward through the filter in my opinion. If you have a waste function and can isolate the floor drains, then that would be fine.
    Jason, TFP Moderator
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    Re: Despite 90-100 degree Texas heat my chlorine levels are.

    Hmmm... OK. I guess I should do some research before I drain it. I suppose I can check with the guys that built it. Thanks for that info!

    As always, I really appreciate the help on here!
    15k in-ground pool and spa || Dark Blue PebbleSheen Finish || Pentair DE Filter || Pentair VS+SVRS Pump

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    Mod Squad woodyp's Avatar
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    Re: Despite 90-100 degree Texas heat my chlorine levels are.

    FC is rising cause we had cooler weather AND cooler water last week too. Down to 68 at night in Texas in August. Almost scary!
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    Re: Despite 90-100 degree Texas heat my chlorine levels are.

    Quote Originally Posted by woodyp
    Down to 68 at night in Texas in August. Almost scary!
    Yeah! That's the "global warming".
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
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    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

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    techguy's Avatar
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    Re: Despite 90-100 degree Texas heat my chlorine levels are.

    I love my 68 degree nights.. stuck at 88F tonight, with 44% humidity. Downright balmy for Sacramento.
    -- Guy --
    10K gallons in 21' Round 52 inch wall Aqualeader AG, Hayward Power Flow LX 1.5 HP pump motor, Hayward Perflex EC50AC DE filter w/Cellulose, Wide mouth skimmer, 2013 new Diver Dan (craigslist) to replace the faded old Hayward AquaBug. TF-100

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