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Brilliant -- that did the trick. Thank you!

My equipment schematic looks like the attached diagram from the EasyTouch installation guide. The valve that controls whether return water goes to the pool or spa is set up so that in spa mode all water is returned to the spa, and in pool mode, some water is returned to the spa, and some to the...

I'll do an experiment and report back. I'll configure it to return no water to the spa except for the last 30 minutes of the day which will effectively shut off the spillway for that time.

It's Pentair EasyTouch. The way it's plumbed, if the spillway isn't active then no return water is being directed to the spa. Maybe that would be okay for all but 20 minutes? I worry a bit that the spa won't be adequately chlorinated if I do that.

Yes, the automation works like this: During normal daily operation, the water is pumped from the pool, and returned to the pool and spa, with the spa spilling into the pool. During spa operation (only when it's in use) the water is pumped from and returned to the spa only. Automated 3-way valves...

Thanks! It's been a process. When my pH is that high I get calcium scaling on the plaster walls. The reason I target pH 7.5 is because Pool Math tells me it gives a slightly negative calcium scaling index. I do have a source of aeration. There's a spa that shares the pump and chlorinator with...

I have a 17,000 gallon, plaster lined, salt water pool with chlorine generator in San Diego. Recent Taylor test results: pH 7.5 (target 7.5) FC 6 (target 6) CC 0 TA 50 (target 60) CH 700 and continually climbing CYA 50 (target 60) Salt 3500 (target 3300) I fired my pool guy two years ago and...