I found this forum, pool school, and the pool calculator about two months ago when I couldn't get my pool algae free here in Las Vegas. I ended up ordering a TF-1000 test kit and found my CYA was > 200 (My usual way of adding chlorine was with dichlor, which Leslie's Pools totally supported!)
Anyways, I partially drained the pool and started using liquid bleach. The pool cleaned up very quickly and has been wonderful ever since! The way you explain everything here and with pool school is great. I always hated going to the pool store and they would tell me to "shock every week" and I'd ask why and they'd say "because you need to!". I hate explanations like that!
Anyways, onto my question. Since I have been using liquid bleach, I'm finding I have to use 5-6ppm per day to keep the chlorine level stable, which seems like quite a bit. My stats are currently:
Size: 15,500 gallons
CH: ~650 (this is freshly filled water, we just have amazingly hard water)
I'm not using any type of solar cover or anything. I'm thinking 5-6ppm per day is quite a bit to be using? Any suggestions? I'm thinking I need to increase the CYA since I am in Vegas and we have tons of sun. Also, we rarely use the pool, maybe two of us every other week for a couple hours, so I don't think it is due to bather load.
If I do want to increase the CYA, how high should I go? Also, I would likely use dichlor to increase CYA, if I do that, am I supposed to dose the dichlor and then wait a week or so before testing or how long do I need to wait before I can test for CYA and be confident that it isn't still increasing?
Thanks for any input and this great site, it has already helped a lot!