Background information: 22,500 gallon gunnite/plaster pool with pebble finish, 5 years old, DE filter, Whisper Flow pump, Nature2 Pro G mineral sanitizer, in-floor cleaning system, no water features, light bather load, sunshine on pool from 9 AM to sunset, located in northeastern Massachusetts.
I use liquid bleach, baking soda and muriatic acid in the pool. The water is crystal clear and feels great. But I donít understand why I need to add so much muriatic acid to keep the pH in range. Iíve kept track of my chemical usage for the last 5 or 6 weeks. TA is usually 80-90, calcium hardness 230 per my Taylor test kit. I donít what the CYA is. One pool place has told me 20 Ė 50 over the summer. Another guy says 78. Take your pick.
I add about 36 ozs of 8.3% bleach every day. So for the past 37 days that works out to 1332 ozs. During that same time Iíve added 495 ozs of 31.45% muriatic acid. So for every 10 ozs of bleach I need to add 3.7 ozs of acid. I know bleach has a very high pH so it will drive the pH up. But during that same time rain enters the pool and our rain is usually acidic.
Is it expected or normal I need to add so much muriatic acid? If this is not normal, what do I need to do get back to a normal regime?