I just got done hooking up a second pump for the reservoir in my flower tent so each tray has it`s own pump. Now each tray is independently controlled and the time staggered so i shouldn't get that annoying pump sucking air sound every other day. We will see how it does but i was replacing 3 - 4 gallons every other day before. So i should be able to leave for longer periods of time. This also means i can add more water into the trays. Before i was getting each tray about 1/3rd full and now each can go well over half without cavitating. This was a big concern for me due to how big the plants were getting and the water was only making about an inch and a half up the pots.