Sailinshuz said:
Bama Rambler said:
Post the results when you get the kit.
As quickly as I am able, I will post a full set of test results.
I am still curious from reading in Pool School, that higher CYA levels require higher chlorination and shock levels, and "
Eventually the CYA level will build up to a point that renders your chlorine ineffective." I don't understand. Does the protection from sunlight that CYA provides to chlorine trap the FC in some way, when the CYA level is very high?
Thanks for your support.
From my understanding, CYA shields chlorine from the sun's uv rays like a layer of clothing protects you from the cold. If you keep adding layers of clothing eventually you will not feel the cold. You will also be so bundled up you won't be able to move around as efficiently as you could in a t-shirt and shorts.
Lets look at a couple of examples: You have a pool. Conventional wisdom has taught you that adding a bag of dichlor shock and 1 tab in the floater every week will keep things nice and clear. For a while it does. What you don't know is the CYA in the shock and the tabs is building up and will only go away if you remove it by draining and replacing some water. The pool is looking cloudy, conventional wisdom says add more chlorine, so now its 2 bags of shock and 2 tabs in the floater every week. Pool looks better for a little while, then suddenly its worse than before. What you don't know is in addition to doubling the chlorine you have also doubled the CYA that you are adding, and the pool is looking worse than ever very quickly! Someone advises you to switch to a cal-hypo shock, that helps for a little while but the CYA is still sky high and now your calcium is rapidly rising. The only way to "fix" the pool is to drain a percentage of the water and refill.
Lets say you are a long distance runner and it is 30 degrees outside. You won't last long in just your shorts and a t-shirt. You need protection from the cold, so you bundle up. Having too much CYA has the same effect as wearing underwear, long johns, sweats, jeans and flannel shirt, sweater, ski suit, and overcoat. Are you well protected from the cold? Yes. Are you going to be an effective long distance runner in this outfit? No! All those clothes will not go away by themselves so you have to remove the layers until you reach the point where you are adequately protected, but can still be effective as a runner. Thus, you have to remove the excess CYA, leaving behind enough to adequately protect the FC from the sun but still be effective as a sanitizer.
For more information on the scientific explanation of how CYA works, read through some of the posts in "the Deep End" section of the forum. :-D
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