I have a 18k pool and a 8' dia spa w/ spill way. I currently circulate the water for 10 hrs per day in the spill over mode. I have read that aerating the water will increase the ph levels which I would assume the spill over from the spa to the pool (12" drop) would qualify. It is a new pool but I am wondering if this is contributing to my ph running high as I am adding about 1 gallon of acid per week.
My next question is should I be running the system in spill over mode or should I be running the spa and pool seperate? I have an autofill on the pool but not the spa so at some point if the water level goes down in the spa I need to circ. from the pool to refill. Also, during the summer temps aren't an issue because the water stays around 90 just with the sun so it doesn't take much to heat the spa, but during the winter I can see this being an issue.
Finally what are the thoughts on automated ph monitoring and balancing? Is it cost effective? And what type of system is recommened.
Any suggestions on filter run times and recirculating ideas would be appreciated.