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Thread: Could someone explain this to me -Chlorine levels...

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    Could someone explain this to me -Chlorine levels...

    It seems like everywhere I read the recommended chlorine level is between 1 - 3 ppm and doing the BBB method the recommended level is 3-5 ppm with swg. Why is that? In my Intex SWG manual it says the ideal level for free Chlorine is 0.4 - 1.5 ppm ... that is way lower than the BBB method...why?

    The manual also states that the ideal level for CYA is between 30-50ppm and the BBB method is between 70-80ppm. Why the difference? Also, I really don't understand the relationship between FC and CYA.

    I would really appreciate it if someone would take the time to explain this to me. Thanks so much!!!
    Intex 15X48 metal frame pool

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    maxepr1's Avatar
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    Re: Could someone explain this to me -Chlorine levels...

    CYA is stabilizer that will help hold your FC at the level you want it at. During the high sun of the day the sun is eating your FC that your SWG is producing. Keeping it at the proper CYA level will maintain FC longer. CYA doesn't burn away rather it goes down through splash out and backwashing. As for the higher suggested levels it will be easier to maintain your pool if following the Pool Calculator simply due to the fact you are less likely to have and algae problems and more stability in your pool. Personally it's a plot by chemical manufacturers to keep us constantly buying there products! Follow the PC and you can't go wrong!
    40'x19' IG Diamond Brite 29K 4' Waterfall/Dive Rock FNS60 DE Inteliflo VS 2hp Whisperflo pumps Aqualogic(P4) SWG TF100 Tester


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    JasonLion's Avatar
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    Re: Could someone explain this to me -Chlorine levels...

    There are two different things going on here. First, higher CYA levels require higher FC levels, something most pool companies don't acknowledge. CYA basically holds some portion of the chlorine "in reserve", meaning you have a lower effective chlorine level. Thus you need to raise the FC level as the CYA level goes up, in order to keep the active chlorine level the same.

    The SWG situation is a separate issue. SWGs don't need to run as much at higher CYA levels, so they last longer when CYA is high. At the same time, a SWG eliminates several of the side effects that make having a higher CYA level a pain. The net effect is that higher CYA levels work better with a SWG than they do when manually adding chlorine, so that is what we recommend doing.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Could someone explain this to me -Chlorine levels...

    ......."As for the higher suggested levels it will be easier to maintain your pool if following the Pool Calculator simply due to the fact you are less likely to have and algae problems and more stability in your pool."

    Amen to that. My SWG manufacturer (Hayward) recommends FC 1-3 (low in my opinion), and CYA of 60-80 (80 optimal). My pool is trouble free (imagine that) at FC of 4-6, CYA of 70-80, and my SWCG operating at 45%. I guess if one had alot of shade, few organics, and light bather load they could get away with those low FC and CYA numbers. With the amount of scorching sun and organics mine is exposed to, I'd have a mess trying to use those numbers. Follow the suggestions here. They work.
    Viking Laguna 14K IG , Smart Pure SWCG, SwimClear C5520 Cartridge Filter, TriStar 1.5HP, SmartControl PLP4 controller.

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    maxepr1's Avatar
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    Re: Could someone explain this to me -Chlorine levels...

    Quote Originally Posted by noaliasneeded
    ......."As for the higher suggested levels it will be easier to maintain your pool if following the Pool Calculator simply due to the fact you are less likely to have and algae problems and more stability in your pool."

    Amen to that. My SWG manufacturer (Hayward) recommends FC 1-3 (low in my opinion), and CYA of 60-80 (80 optimal). My pool is trouble free (imagine that) at FC of 4-6, CYA of 70-80, and my SWCG operating at 45%. I guess if one had alot of shade, few organics, and light bather load they could get away with those low FC and CYA numbers. With the amount of scorching sun and organics mine is exposed to, I'd have a mess trying to use those numbers. Follow the suggestions here. They work.
    Noaliasneeded, you got that right! Last year at this time I was at 75% on the generator! Now I'm at 45% and I'm probably going to have to turn it down to 40% soon! Holding FC so well that I maybe having a bleach sale soon....lol!
    40'x19' IG Diamond Brite 29K 4' Waterfall/Dive Rock FNS60 DE Inteliflo VS 2hp Whisperflo pumps Aqualogic(P4) SWG TF100 Tester


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    Re: Could someone explain this to me -Chlorine levels...

    The people who recommend the lower FC levels also recommend clarifier, algaecide, phosphate remover, routine shocking etc.

    For some reason they can't seem to figure out that if you need all of those things, then their recommended FC levels must be insufficient.

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    Re: Could someone explain this to me -Chlorine levels...

    Said another way, if you start out at 1.0 - 1.5, you can quickly go to 0 and algae will gain a foothold. Better to have a little reserve.Good luck!
    Larry
    16x28 vinyl inground kidney, 1HP pump, sand filter, Compupool SWG, 11K gallons

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