I'm a CPO for a hotel/casino in Las Vegas and have been for 13 years now. All this time, we have been using Trichlor for both the pool and the spa.
The pool is 38k gallons. The problem is during the Summer it gets so hot, that we max out the Chlorine feeders, constantly pumping trichlor into the pool. It's a manual, Rainbow 300-29x feeder and we have 2 of them for the pool. Trichlor has Cyanuric Acid in it, which lowers pH. The constant feeding of Trichlor during the hottest parts of the summer decreases the pH in the pool and it's a struggle to keep it up to 7.2. We dump in 6 pounds of Soda Ash every morning and it barely gets the pH to 7.2. In the meantime, doing this increases Total Alkalinity to over 200...
The Health Department only allows the Total Alkalinity to get to 120. Anything over and we get a write up in the report.
Columnizing acid doesn't work.. it lowers TA, but it also lowers pH and defeats the purpose.
So, now our local pool supply recommended switching over from Trichlor to Calcium Hypochlorite, which doesn't have Cyanuric Acid. This should fix the problem that we have.
Does anyone here have any experience with Cal Hypo?
Also, aerating the pool as suggested here is not feasible for our pool.