Thank you everyone for the info.
FPM, my CH is only 40. Its remarkably low. I don't think high CH is a problem, lol low CH maybe an issue tho.
I was thinking of RO from 2 points of view. First, if I buy a place with a pool and the water chemistry was really bad, I was trying to get an idea of what my options were.
The other was from a cost/benefit point of view. Assuming it costs a similar amount to dump and refill, it seems like it would be a good option in general. As I understand from reading here, dumping a lot of water from a pool at one time can be risky, creating possible problems with liners and such. Dealing with a tremendous amount of waste water could be tricky as well. RO seems to help mitigate both of these to a some degree.
I recently moved out here from CA. Back there the water situation was very different. The pH was high, the water was very hard and in short supply (rationing, steep progressive usage costs, etc...). We had to deal with a lot of scaling and hard water issues, especially with our appliances. Also, the soil doesn't handle lots of water well at all. Out here, the water out of the tap, pH: 7.5, CH:40 TA:50 TC:2. (hehe, I love playing with my new kit). We get something like 50+ inches of rain a year. Last night, we got about 2 inches and I don't seem to have any erosion or flooding.
I guess my thinking is still somewhat tied to CA. To be honest, after living there for a few years, I feel a little guilty wasting water.