I'm almost at the point to plumb the system and would like any suggestions. My goal is, I'd like to have all the plumbing in the sump area modular. Giving me the ability to valve off an isolate any given section of the plumbed system. To start, I don't plan on having an ATO system or automated dosing. In the future I'd like to add various reactors and a UV. So I'm trying to plan ahead. With just a basic sump setup (to start) i.e sump, fuge, skimmer, return pump (variable speed), does anyone see a need to add a gate valve? If I did add a gate valve, I'm thinking it would fall on the discharge side of the return pump... Any thoughts or suggestions?