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Thread: Recommendation for CYA

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    cfclay's Avatar
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    Recommendation for CYA



    What is THE recommended CYA - 30? I always see the range. I'm guessing 30 is optimal, but at 50+ , the only concern is you would save some money on chlorine if you would drain some and and correct?
    Intex 22' x 52" - Intex Krystal Clear Sand Filter Pump - flow rate: 2,150 gal per hour
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    Waiting to stop relocating until I build my dream pool!

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    Mod Squad tim5055's Avatar
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    Re: Recommendation for CYA

    Here is the FC/CYA Chart

    Many time CYA depends on your location. Arizona pools need more than those in Maine.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    cfclay's Avatar
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    Re: Recommendation for CYA

    Quote Originally Posted by tim5055 View Post
    Here is the FC/CYA

    FC/CYA Chart

    Many time CYA depends on your location. Arizona pools need more than those in Maine.
    Was there a link or attachment? I don't see one.
    Intex 22' x 52" - Intex Krystal Clear Sand Filter Pump - flow rate: 2,150 gal per hour
    TFTest Kits TF-100
    Waiting to stop relocating until I build my dream pool!

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    Texas Splash's Avatar
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    Re: Recommendation for CYA

    The correct CYA depends on your pool, location, climate, season, etc. It gets hot there in the summer, so you may find that a CYA of 50 +/- 10 works better for you in the summer. In the winter you may do fine with a much lower CYA because the sun/heat are not as intense. Your FC loss will help you judge that. Of course when we keep CYA higher, it does mean more bleach if we had to SLAM, but we hope to avoid that by maintaining our target FC 24/7.

    - - - Updated - - -

    Tim listed the Chlorine/CYA Chart link. If you're on a mobile device, sometimes they have problems seeing links. I have that same link in my sig below.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Mod Squad tim5055's Avatar
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    Re: Recommendation for CYA

    Quote Originally Posted by cfclay View Post
    Was there a link or attachment? I don't see one.
    click on the FC/CYA
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    cfclay's Avatar
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    Re: Recommendation for CYA

    I'm finding that each day this week the FC is dropping from my goal of three to .5 or 1. That has been with some swimmers (it's cold- maybe 4 for 60-90 mins). I rechecked by CYA today and think it is lower than originally thought. I think it's probably 30, maybe 20-25 for that dot to totally cloud over, so I wanted to be cautious about how much more to add.
    Intex 22' x 52" - Intex Krystal Clear Sand Filter Pump - flow rate: 2,150 gal per hour
    TFTest Kits TF-100
    Waiting to stop relocating until I build my dream pool!

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    cfclay's Avatar
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    Re: Recommendation for CYA

    Quote Originally Posted by tim5055 View Post
    click on the FC/CYA
    Thanks- I see the link when I switch from tapatalk to web. Not to split hairs, but I don't see where that shows what CYA level should be, but rather what the FC goal should be for a given CYA.
    Intex 22' x 52" - Intex Krystal Clear Sand Filter Pump - flow rate: 2,150 gal per hour
    TFTest Kits TF-100
    Waiting to stop relocating until I build my dream pool!

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    Texas Splash's Avatar
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    Re: Recommendation for CYA

    Well, you must get an accurate CYA reading for sure. But you can't test it indoors. You must be outside on a sunny day, sun at your back. That's a must. So try that again tomorrow and if needed, pour the solution back & forth and re-try the test as much as you need to. The CYA is the foundation of the proper FC level, not the other way around. And if you suspect the CYA is below 30, it "may" actually be much lower since those tubes only go down so far in numbers.

    As for FC loss, if you are experiencing an FC loss of more than 4 ppm in a 24 hr period, algae is suspect .... or there's not enough CYA to protect your FC during the day. You can always do an overnight (OCLT) test to rule-out the algae, then you know it's just a matter of increasing CYA to at least 30, maybe even 40 in your area as it warms-up.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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