1st test results - CYA down to ZERO?

[chem geek]

Sounds like a good plan. If you are impatient and want to get your CYA level up faster you can:

1) Put CYA into panty hose and have it hang over the side of your pool over a return. That's PatL's idea and people swear by it. Dissolves in about 24 hours.

2) Buy Instant Pool Water Conditioner by Natural Chemistry which is a slurry of the monosodium salt of CYA. It dissolves quickly in water (unlike regular CYA which takes a long time to dissolve).

3) Add Dichlor to your pool. For every 1 ppm FC you add, you will also add 0.9 ppm CYA. Dichlor quickly disolves in water.

However, your current plan should be fine as even a small amount of CYA protects chlorine from breakdown from sunlight.

As for the CYA going to zero, that is explained earlier in this thread by waterbear where there are anearobic bacteria that consume CYA. This explanation makes sense when the FC level gets to zero. What I have yet to understand is how this happens when the FC does not go too low -- I would hope that this bacteria could not survive in the presence of FC.

Richard