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Thread: Effect of CYA levels

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    Effect of CYA levels

    I have a SWCG and normally try to run my CYA level between 60 to 80 ppm. During the last couple of months, I noticed that to maintain an FC level above 3 ppm I had to increase the setting on the SWCG. At the time I thought that this was due to the summer sun.

    Like just about everyone, I have had trouble getting accurate readings on the CYA test. The readings depend on many factors including ambient lightin conditions. I check the CYA level at the beginning of each month. Last month, for some reason the reading was very low ~30 to 40 ppm. I promptly added enough CYA to bring the level up to 70.

    Anyway my FC level jumped from 3 to 5 ppm in less than one week after adding the CYA. This is dramatic proof of the effect CYA has!
    7,500 gal, IG pool, L shape 22' x 15', 1.5 hp pump, cartridge filter, AquaPlus SWG/Controller, Pebble-Tec liner.

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    polyvue's Avatar
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    Re: Effect of CYA levels

    Quote Originally Posted by dschlic1
    Anyway my FC level jumped from 3 to 5 ppm in less than one week after adding the CYA. This is dramatic proof of the effect CYA has!
    Indeed. On my fantasy wish list is a more precise measurement of CYA than the "visual" turbidity test that's so prevalent and a truly smart SWG controller that could adjust itself based on an internal, reliable measurement of free chlorine. Shouldn't have to go into "setup" mode to calibrate the SWG every time the CYA changes a bit, or when any number of other factors change (solar cover, bather load, more/less sunshine.) They can send people & probes to the moon and to the stars but they can't make a mass-market instrument that measures free chlorine?
    14,555 gal in-ground 16'x29' white plaster Pool w/spa (2007); Goldline Aqua Logic AQL-PS-8 control w/Aqua Cell 15 Salt Water Chlorination (SWCG); Hayward TriStar 1HP (1.85 SF) main / 1.5HP (1.60 SF) spa pumps; Hayward Swimclear cart filter C4025, ColorLogic LED lights; Tankless SP-18-4 electric heater; Polaris 280 cleaner.
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    Re: Effect of CYA levels

    There are instruments that measure free chlorine. They just cost $1000 to $1500
    7,500 gal, IG pool, L shape 22' x 15', 1.5 hp pump, cartridge filter, AquaPlus SWG/Controller, Pebble-Tec liner.

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    polyvue's Avatar
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    Re: Effect of CYA levels

    Quote Originally Posted by dschlic1
    There are instruments that measure free chlorine. They just cost $1000 to $1500
    Somehow I just knew that would be the price... My pool builder must have screwed up in not offering it.

    Now, I guess the question is this: is the instrument reliable enough to be used as controller input to a SWG? Hmmmm?
    14,555 gal in-ground 16'x29' white plaster Pool w/spa (2007); Goldline Aqua Logic AQL-PS-8 control w/Aqua Cell 15 Salt Water Chlorination (SWCG); Hayward TriStar 1HP (1.85 SF) main / 1.5HP (1.60 SF) spa pumps; Hayward Swimclear cart filter C4025, ColorLogic LED lights; Tankless SP-18-4 electric heater; Polaris 280 cleaner.
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    Mod Squad Bama Rambler's Avatar
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    Re: Effect of CYA levels

    We use chlorine instruments where I work that are good enough for control but you'll have to add a zero to the afore mentioned price to get one. Yeah $10,000.00 for one of them.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: Effect of CYA levels

    Quote Originally Posted by Bama Rambler
    We use chlorine instruments where I work that are good enough for control but you'll have to add a zero to the afore mentioned price to get one. Yeah $10,000.00 for one of them.
    Bama... I said it'd be great if they made a mass-market instrument. For that money, why not get three or four?! One on the pool, one on the shelf, and two for Christmas presents to deserving friends or relatives... heh heh
    14,555 gal in-ground 16'x29' white plaster Pool w/spa (2007); Goldline Aqua Logic AQL-PS-8 control w/Aqua Cell 15 Salt Water Chlorination (SWCG); Hayward TriStar 1HP (1.85 SF) main / 1.5HP (1.60 SF) spa pumps; Hayward Swimclear cart filter C4025, ColorLogic LED lights; Tankless SP-18-4 electric heater; Polaris 280 cleaner.
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    View of spiral galaxy in Ursa Major NGC6217 - Hubble Telescope 2009

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    Re: Effect of CYA levels

    Hach makes an online chlorine analyzer for about $2,500 which also includes a pH instrument. Others make similiar units Google "Amperometric Chlorine".
    7,500 gal, IG pool, L shape 22' x 15', 1.5 hp pump, cartridge filter, AquaPlus SWG/Controller, Pebble-Tec liner.

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