I was planning on having an RO treatment done to reduce my CH level, which had gotten over 1,000. The local company after giving the run around for a month called last week and said the pump was out on their equipment. They would have to reschedule, date unknown.
I tested my tap water (as the CH varies time to time) and the current CH was 150. So, I decided on a full drain and refill. I fully drained the pool and rinsed it down (didnt pressure wash or acid wash) and refilled the pool. There was no perceptible scale on the pool. I added my chemicals, 400 lb salt, 10 lb CYA, 14 boxes of borax, and 4 gallons of muratic acid to rebalance pH. Time to do a full battery of tests on my new water.
Now I do all my tests and my water has a CH of 250. How did it go from 150 at the tap to 250 in the pool?
I could see it going up if there were a lot of scale on the pool and/or I had the CSI negative for some time. But, neither is true and the water has only been in the pool a couple days.