All,

After reading horror stories about public hottubs, and the fact that the typical 4-5ppm Cl in a pool equates to a very very tiny amount of total Cl when that concentration is in a spa, I want to keep my Cl concentration much higher in the spa vs. the pool (say 10-15ppm vs. 5ppm in the pool). But I only have one pump, one filter, etc. and my returns go to the pool and the spa, so that the spa and pool are effectively one big body of water into which Cl is added. How can I keep the Cl levels higher in the spa all the time? Should I just *never* allow spa spillover, thereby never mixing spa water with pool water, and monitor Cl levels separately? That sounds pretty labor intensive and I imagine I'd be constantly adjusting water level and Cl level in the spa. How do others do it?