I'm getting ready to do some major re-plumbing as well - I'll be adding a new heat pump in the near future and a SWG later. Plus, I need to remove some leaking, rusty gate valves from the original install. What do folks recommend for fittings/connections - should I be using PVC slip unions everywhere or are those usually reserved for big things (filters, heaters, pumps) while Jandy valves are just glued in place? Thanks!