Work has started on the plumbing today, starting with the return pipework. Added valves for frag tank, reactor and one spare. I also added connection points for the UV system.
My previous tank had the UV feed draining to the sump, this time I will try it plumbed back into the return to the tank, adding a valve after the UV to regulate the flow and not create negative pressure over the bulb.
I will also add a fixed pipe from my mixing station for easier water changes