My pool/spa is being finished withing a few week and I've been reading as much as I can about the TFP method. One item I cannot find is how to treat a SPA that has a spillway into the pool. My guess is I treat each separately and then adjust chemicals after all swimmers have left, bringing each back to normal ranges. The heated spa water will probably play havoc on the pool water chemical ratios. I don't plan on using bromine, just chlorine. Any thoughts on this much appreciated.