Tony,
OK, thanks. Now I get the 100 minute cycle significance. And thanks for describing your pool environment - it helps quite a bit and is similar to my environment. Can you just let me know the gallonage of your pool? That would help me make a better comparison of the overall environment.

Richard,
Thanks for the info comparing generated chlorine to the liquids. Yes, you are probably right that my chlorine consumption is no where near 6PPM per day. I can't say I know my 'typical' daily consumption, because I haven't really tried to track that. So if I really need to replenish 3PPM every day, then a 52% "on-time" is between12 and 13 hours of filter/pump time with the output set at 100%.

Thanks again to both of you!