Creating a heater bypass

I have separate plumbing for my pool and spa, each with its own heater and its own SWG. I recently had my pools and spa resurfaced with fresh Diamond Brite, and the contractor did an extremely low pH acid wash which he wanted me to leave for three days. Ignoring the pros and cons of my situation, in a pinch I re-spliced my plumbing to exclude the heaters and SWGs while the water was very acidic. But next week I will want to repair my system. After and before photos below.

Having said...

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