Thanks for your help everyone.

Here are my stats:
- Pool is in ground in California in a very hot, dry climate. It is plastered (if that is the right term for the pool floor, if not please correct me).
- Very little visible algae growing. 3-4 dime size patches of reddish algae on the stairs.
- Water looks clear to me although the pool servicer told me it looked slightly cloudy to him. I am new to owning a pool so maybe I can't see the cloudiness yet.
- CYA level: 150
- Chlorine: 0
- ph: 7.8
- TA: 160

A pool servicer told me I had to drain it and power wash the walls or it would be green within 2 weeks. I had him add a bunch of liquid chlorine and 2 weeks have gone by and it looks fine. Chlorine is at 0 again of course but his prediction that algae would grow rampant hasn't come true. So I am hoping I can squeak by this summer by adding a lot of chlorine frequently. Can you advise if it is still safe to swim in this given the very high CYA level (I appreciate Pool Doc's response but just want to double check now that I have posted the CYA level)?

Any other advice would be much appreciated.

Thanks very, very much.