why NOT keep a high CYA ?

Problem with trichlor is that your CYA will be constantly rising instead of staying stable and that will require higher and higher FC levels to compensate. If you up the chlorine levels using only trichlor you will cause your CYA to rise even faster. Also be aware that CYA levels above about 100 ppm have been found to damage plaster pools.

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Originally Posted by adesalvo

Doesn't this in effect speak FOR using tri-clor? Tri-chlor is fairly comparable to bleach on price, however, it is simple to use and purchase.

I have been running my CYA at 30 this season and have been using about 3 ppm of Cl. This seems pretty good (I guess) as I have a 25,000 gal IG in full sun and no cover (too lazy) and a very heavy swimming load.

Short of SWG, I would be surprized if I could get away from daily bleach addition.

But, if taking my CYA to 80 (or higher) is the solution, then I am all for it..

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Trichlor isn't always a bad thing....you just have to know what you're doing in order to use it effectively. One other thing you need to be careful about if using strictly trichlor is that it tends to drive pH WAY down. My pool wants to run a high pH if left unattended, so it's not a problem for me, but it can damage your pool if it gets too low.

Janet

I had been consumin 2~3PPM/day which was a about a jug or jug and 1/2 of 96oz 6% bleach/day. Bleach works great but buying/lugging ~10 jugs of bleach/week is definately not very convenient.

Think I'll boost my CYA to ~90-100 PPM and keep my FC ~7~8PPM. I lose enough water through splashout/overflow/backwashing so that I'm not too worried about CYA build up. If there's little downside to high CYA, why not?

Here's an informal bleach usage survey I ran last year...
http://lee.smugmug.com/photos/82681038-O.jpg