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I'm about to start a dwc grow, i've only grown in soil before. I've read A LOT and every once and a while you read something and cant find it later, but is the air pump supposed to be left on all the time? or is there an outlet timer needed for it? also, any other tips that you don't usually...

I've been thinking about starting hydroponic growing. I was thinking about a dwc system. I found this and it looks like it'll fit what i want to do more. Anyone tried it or have it going now? My question is, it says ''one aquarium water pump pumps water from one end of the system to the other...