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Thread: CYA Level?

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    CYA Level?

    The skylight in my signature is centrally located over my pool (2ft over 14ft pool length, 4ft over 6ft pool width, recessed 21 in. above pool room ceiling, ceiling 64 in. above water level). The amount of sunlight that hits the water is dependent on the time of year and day when I am using the pool and for how long, typically 30 minutes per day. Assuming that the pool cover will block sunlight from impacting the chlorine, what CYA level would you recommend?
    Endless Pool Owner, since April 2015, 6 ft by 14 ft , 51 inches deep, 2677 gallons
    AG, indoor; 2 by 4 skylight, always covered with solar pool blanket when not in use, temp at an indicated 85, Taylor K
    Delta EA-4H UV Sanitizer, inline with circulating pump
    Pleatco PWW50L cartridge filter

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    Richard320's Avatar
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    Re: CYA Level?

    I'll suggest 30. You can't really even read lower than that with some testers. You'd never know if it was all gone.

    With 30 CYA and hardly any sunlight, your chlorine losses should be laughably small. You'll be dosing with a teaspoon.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    chiefwej's Avatar
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    Re: CYA Level?

    The skylight itself will block a large portion of the UV spectrum.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Mod Squad pooldv's Avatar
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    Re: CYA Level?

    I agree that 30 is best because it is measurable. And there is no downside to 30.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: CYA Level?

    Given my profile description and vinyl liner, one person using it for 30 minutes a day, what would be your recommended levels, with the CYA at 30?
    Endless Pool Owner, since April 2015, 6 ft by 14 ft , 51 inches deep, 2677 gallons
    AG, indoor; 2 by 4 skylight, always covered with solar pool blanket when not in use, temp at an indicated 85, Taylor K
    Delta EA-4H UV Sanitizer, inline with circulating pump
    Pleatco PWW50L cartridge filter

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    Richard320's Avatar
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    Re: CYA Level?

    Quote Originally Posted by sfsendlesspool View Post
    Given my profile description and vinyl liner, one person using it for 30 minutes a day, what would be your recommended levels, with the CYA at 30?
    Target 3, minimum 2. You might be able to go a couple days between additions. Only testing will tell. Just stay above 2 FC and you won't have any problems.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    York,Pa
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    Re: CYA Level?

    Interesting. The manufacture recommends between .5 and 1.
    Endless Pool Owner, since April 2015, 6 ft by 14 ft , 51 inches deep, 2677 gallons
    AG, indoor; 2 by 4 skylight, always covered with solar pool blanket when not in use, temp at an indicated 85, Taylor K
    Delta EA-4H UV Sanitizer, inline with circulating pump
    Pleatco PWW50L cartridge filter

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    Mod Squad pooldv's Avatar
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    Re: CYA Level?

    The MFG probably can't even spell CYA and has no idea what it is or what it does.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Richard320's Avatar
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    Re: CYA Level?

    Quote Originally Posted by sfsendlesspool View Post
    Interesting. The manufacture recommends between .5 and 1.
    That would be with no CYA. And that .5 FC with no CYA is probably harsher than 3 with 30 CYA.

    The graph's a little hard to read, but if you're into technical stuff...

    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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