I’ve been hanging out in this sub for a few days. I have been using liquid chlorine, and an in-line chlorinator, but I cannot find tabs without stabilizer easily. I would like to install a swcg unit. I’m attaching a picture of my plumbing. In between the filter and the heater is the return line to the pool. It is my understanding the unit should be installed after pump filter and heater. There is a check valve, and what looks like a copper line from heater (some sort of ground?). Should these two items be moved before the swcg, or can they be moved to be after? I was looking at the rj60 I believe. My pool is right about 20k gallons, vinyl, and the price difference was negligible to the next lower unit, so it is 3x size needed. Any advice is greatly appreciated.