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Thread: How to lower CYA?

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    How to lower CYA?

    I've been reading up on pool maintenance on this site in anticipation of building our first pool this winter. I think I kind of understand the relationship between FC/CYA, but was wondering that if over time CYA climbs too high, is there a way to reduce it besides doing a partial drain and refill? Also, at what point would this recourse be a consideration?
    2016 Build: 32x8 Gunite, 6,700 gallon IG pool including 6x8 spa and 6x8 tanning ledge w/ 2 bubblers. 32' raised wall with two sheer descent water features. Travertine Coping w/ split faced Travertine on raised wall face. 2HP VS Jandy pump, 400k heater, Rainbow Chlorinator, 4 Colored LED Lights. 459sqft spray deck plus. IAqualink remote, Polarus 9350 Robot Cleaner.

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    Mod Squad JVTrain's Avatar
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    Re: How to lower CYA?

    CYA can only be lowered by water replacement or by reverse osmosis treatment of the water. Reverse osmosis treatment is not always available and only a last resort if you are on a very strict water limitation. Water, while a precious resource is almost always cheaper than reverse osmosis. You can see from the Pool School - Chlorine / CYA Chart that depending on your chlorination type (manual or SWG) you should lower CYA when it's above 60 for manual chlorination or above 80 for SWG chlorination.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Mod Squad tim5055's Avatar
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    Re: How to lower CYA?

    Nice to see you doing your homework ahead of time!

    Joel has explained it well, water replacement or RO.

    The key to our whole system of pool care is accurate testing and knowing what you add to the pool will do to the pool BEFORE you add it.
    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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    Re: How to lower CYA?

    Quote Originally Posted by tim5055 View Post
    Nice to see you doing your homework ahead of time!

    Joel has explained it well, water replacement or RO.

    The key to our whole system of pool care is accurate testing and knowing what you add to the pool will do to the pool BEFORE you add it.
    Yea, that's what I thought about water replacement. So that leads me to wonder what other people that don't follow the TFPC Method do. From what I understand, using DiChlor/TriChlor tablets can raise the CYA pretty quickly. So, are those people partially draining and refilling their pools constantly?
    2016 Build: 32x8 Gunite, 6,700 gallon IG pool including 6x8 spa and 6x8 tanning ledge w/ 2 bubblers. 32' raised wall with two sheer descent water features. Travertine Coping w/ split faced Travertine on raised wall face. 2HP VS Jandy pump, 400k heater, Rainbow Chlorinator, 4 Colored LED Lights. 459sqft spray deck plus. IAqualink remote, Polarus 9350 Robot Cleaner.

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    Re: How to lower CYA?

    Quote Originally Posted by Mamiamjo View Post
    Yea, that's what I thought about water replacement. So that leads me to wonder what other people that don't follow the TFPC Method do. From what I understand, using DiChlor/TriChlor tablets can raise the CYA pretty quickly. So, are those people partially draining and refilling their pools constantly?
    Yep
    Every few tears I mean years.....
    35,000 Gal. - 40x20x8 - Plaster - SWG Pentair IC 60 - Barracuda G3 Vacuum - Hayward c1750 Cartridge Filter - Blue Torrent VS 1.5hp pump - Pool is 45 years old.

    "I'd build a deck over my pool if I didn't have a SWG"

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    Mod Squad kimkats's Avatar
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    Re: How to lower CYA?

    Yes that is just what they do......................or they get a HUGE green mess and come here for help after they have spent $XXXX at the pool store and it did NOT help.

    The pool store will tell you that you water is "old" or in "chlorine lock" AKA the CYA is too high!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Mod Squad tim5055's Avatar
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    Re: How to lower CYA?

    Quote Originally Posted by Mamiamjo View Post
    Yea, that's what I thought about water replacement. So that leads me to wonder what other people that don't follow the TFPC Method do. From what I understand, using DiChlor/TriChlor tablets can raise the CYA pretty quickly. So, are those people partially draining and refilling their pools constantly?
    Some do.
    Some are "lucky" to live in areas that require closing and draining a lot of water each winter.
    Others live in areas blessed with lots of rain to dilute the CYA.
    A small minority are just lucky that even with high CYA their pool remains clear.
    Then the other help pay the boat payments of the pool store owner
    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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