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Thread: Raising CYA

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    Join Date
    Oct 2015
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    Raising CYA

    I run my SWG at 100%. If my FC goes up or down when I check it weekly, I adjust the the time the SWG is running. Currently, it runs at 12 hours per day to maintain 6ppm. My CYA is 60-70 ppm.
    Is there a scientific way to predict how much time I could reduce the SWG to maintain the FC levels if I raise the CYA to 80 ppm?
    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 pooldv's Avatar
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    Re: Raising CYA

    Not that I am aware of, but there is very good likelihood that your chlorine loss would be reduced with higher CYA.
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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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    mikemass's Avatar
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    Re: Raising CYA

    I think it's just trial error to figure out the right mix during "normal" circumstances. Sorry I can't help with a more scientific way to calculate this. I am dealing with the same thing right now. I have posted my results in another thread.

    But the problem is what is "normal" circumstances? Some days are sunnier than others. Some days might get rain. Is it a day after 10 kids just swam in pool for 5 hours? Was there a large wind that just dumped a bunch of leaves and organic debris in your pool? Is the pollen content high where you currently are?

    Unfortunately all these variables affect chlorine usage day in and day out. Which is why checking your levels on a regular basis in necessary and adjust accordingly.
    25 + year pool owner. Current pool (going on 11th year) - 38K gallon in ground Gunite/White Plaster, Spillover Spa, Hayward Cartridge Filter, Hayward 450k BTU NG Heater, Hayward Goldline Aqua Logic control with T-Cell-15 Salt Water Cell, Dolphin Explorer.
    You Need: Bleach, a A Test Kit & a Bookmark to "Pool School". Now what's your question?

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    themadangler's Avatar
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    May 2016
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    Southampton, NJ
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    Re: Raising CYA

    Just looking at the info in your sig and comparing to my pool, I know every pool is different, but we have about the same volume of water. You have to the ic60 and me the 40. Im currently running at 80% and about 10 hours per day. At the advice of a someone here I changed my timer to run during the middle of the day when my pool get the most sun and I've been holding at FC 6.5 for a few days now. I'm decreasing my timer again in a couple of days and monitoring the FC in an attempt to fine turn my swg timing. I see your pump is 1/2 hp smaller, than mine so perhaps that's a place to start if your goal is to decrease run time. I'm also raising my cya up to the 70-80 ppm range, not there yet but holding FC 6.5. I'm a new 1st time pool owner so take what I say with a grain of salt...just an observation.


    quote]=Philo;1047270]I run my SWG at 100%. If my FC goes up or down when I check it weekly, I adjust the the time the SWG is running. Currently, it runs at 12 hours per day to maintain 6ppm. My CYA is 60-70 ppm.
    Is there a scientific way to predict how much time I could reduce the SWG to maintain the FC levels if I raise the CYA to 80 ppm?[/QUOTE]
    Diamond Pool 20'x40' Lazy L, approx 33,000 gal vinyl liner, Hayward s244T filter, Pentair Intellichlor Ic 40( new May 2016) replaced computer pool cpsc35, inter mastic T40404R, A.O.Smith UST1152 super pump 1.5 hp, Hayward heater, not working or by-passed, Polaris 360

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    Join Date
    May 2015
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    Land O Lakes, FL
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    526

    Re: Raising CYA

    This is a tough one. I am working through the same issue right now trying to figure out the right percentage and pump runtime and with variables such as rain sun and bathing load.

    Matt
    2016 Pool Build: 12k IG Blue Granite Pebblesheen, Travertine Coping & Pavers, Pentair IntelliFlo, Intellichlor, Easytouch, Clean & Clear 320, Heliocol Solar - TF-100 test kit w/ SpeedStir
    SWG Run Time Calculator

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