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Thread: Can I, or should I raise my CYA?

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    Can I, or should I raise my CYA?

    Right now I am going through just over 1.42G of bleach a day with minimal pool use. I am adding a jug every days but every 3-4 days I have to add an extra 1/2 jug to keep my FC between 4-6/7. My CYA is at 50 right now, if I bump it up to 60 will that cut down on the chlorine I am having to add daily?

    FC 7
    CC 0
    TA 90
    CYA 50
    PH 7.6
    18x36 Vinyl In-ground w/roman ends 27,400G, Hayward 3/4hp with 300# sand filter. Hayward heat pump heater

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    frogabog's Avatar
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    Re: Can I, or should I raise my CYA?

    I wouldn't think so, since the range between target and minimum stays the same (4ppm). It just allows you to have 1 more ppm of "reserve".

    I could be wrong of course. I'm just going by what the calculator says.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
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    Mod Squad woodyp's Avatar
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    Re: Can I, or should I raise my CYA?

    Looks like pretty normal chlorine demand for that size pool to me.
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    Re: Can I, or should I raise my CYA?

    Quote Originally Posted by woodyp
    Looks like pretty normal chlorine demand for that size pool to me.
    Agree. You have a large pool and that seems like a pretty normal consumption.

    Yes, you can raise your CYA but I think that it is probably good where it is. You just have a big pool.

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    Re: Can I, or should I raise my CYA?

    Okay, thank you. I thought I was a little on the high side but I guess not. Next year I am going with a SWG so that will help a little.
    18x36 Vinyl In-ground w/roman ends 27,400G, Hayward 3/4hp with 300# sand filter. Hayward heat pump heater

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    Re: Can I, or should I raise my CYA?

    One more little thing! With my CYA at 50 my FC should be between 4-6. I have been raising my FC to 7 because by the time I check it in the evenings my FC has dropped to the bottom of the range, usually more like 3-3.5. Is it worth adding that extra chlorine every night or is it burning off fast because it is above the CYA range? Should I just be raising it to 6ppm?
    18x36 Vinyl In-ground w/roman ends 27,400G, Hayward 3/4hp with 300# sand filter. Hayward heat pump heater

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    frogabog's Avatar
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    Re: Can I, or should I raise my CYA?

    Pool calc says for 50ppm CYA, minimum is 4, target is 8, and shock is 16.

    The chart in pool school is different than the pool calculator for some reason. I've been using the calculator numbers instead.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

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    Mod Squad Bama Rambler's Avatar
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    Re: Can I, or should I raise my CYA?

    In a 27,000 gal pool using a large (182oz) jug a day, you're losing 3.3 ppm per day. That's not too bad, but you may be able to get close to 2 ppm by raising your CYA to 60. I'd try it and see what happens. Given the variability of the test, you may not have quite as much as you think you have in there.
    Dave J. TFP Moderator
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    Diver's Avatar
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    Re: Can I, or should I raise my CYA?

    solar cover will help to minimize the chlorine loss. i have 30k pool and without a cover it loses 1.5 per day, with the cover it only loses 0.5 ppm
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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    Re: Can I, or should I raise my CYA?

    I went ahead and re-tested my CYA levels last night while I was testing everything else and my CYA had dropped to 45ppm. With my pool being in direst sun all day that might be why I am going through, what I consider to be, a little too much chlorine. I am going to add some stabilizer today that will bring it up to 58ppm. We'll see what that does to my chlorine usage. I love this stuff......it's like my pool is a giant chemistry set!
    18x36 Vinyl In-ground w/roman ends 27,400G, Hayward 3/4hp with 300# sand filter. Hayward heat pump heater

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    Re: Can I, or should I raise my CYA?

    Okay, so I picked up some stabilizer at work to raise my CYA. Read the bottle that said to either broadcast in the deep end or add directly to the skimmer. So, I broadcast the CYA around the deep end and then prepared all of my gear to vacuum the pool. When I got my trusty pole, hose a vacuum head all hooked up and ready to go I got in the pool to lightly brush the corners of the deep end and noticed all of the CYA sitting on the bottom on my liner. IT was at that moment that I recalled reading something about a mesh sock for adding chemicals like this. Anyway, to shorten this story up a bit, I didn't like the idea of the CYA sitting on the liner while it dissolved so I vacuumed it into the filter. I figured if it was OK to add it to the filter, there is no reason not to vacuum it up and but it there. Anyone see a problem with this? Filter pressure went up about 1psi which I figure is about normal for this.
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    Re: Can I, or should I raise my CYA?

    Good job vac'g it to the filter, BOR. If you had asked, that is exactly what we would have suggested you do
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    Mod Squad Bama Rambler's Avatar
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    Re: Can I, or should I raise my CYA?

    You did the right thing. If you read around here a bit you'll see that there are only a few chems that we recommend broadcasting. Salt's about the only thing.
    Dave J. TFP Moderator
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    Re: Can I, or should I raise my CYA?

    Good to know I guessed right! This pool stuff is getting to be fun!
    18x36 Vinyl In-ground w/roman ends 27,400G, Hayward 3/4hp with 300# sand filter. Hayward heat pump heater

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