I'm fairly new to pool chemistry but am working on a business school project for some uses of CO2 in non traditional aspects and have been reading on its use as Carbonic acid to lower pH in pools to maximize chlorine effectiveness. For anyone that has used CO2 or has contemplated making the switch, could you help answer some of the following:
1. Besides all of the safety highlights of using CO2 vs. HCl, what are the pros and cons of the two? I've read about alkalinity issues with CO2 (at least it doesn't lower alkalinity). Also, does using HCl force pool owners to replace equipment (pumps, pipes) more often than a non corrosive CO2?
2. Are there any economic benefits of using CO2 vs. HCl? I know there are liquid CO2 suppliers who rent tanks and then come fill them up once a week or a couple times a month based on the size of the pool, but the control and injection equipment for CO2 may be more expensive
3. If I were looking at converting a pool using "X" gallons of 30% muriatic acid solution per day, how could I convert this to a number of pounds of CO2? Just to look at the cost/benefit analysis
4. Are you seeing any trends/shifts in the number of commercial pools moving towards CO2 for safety reasons?
Any help would be appreciated, thank you.