You could use one slightly bigger pumps to run all and just have solenoids on each line to cut down on wiring and parts .I'm very late to the party hope you are still around.I grabbed 5 of these 3-6v pumps, will use them to water the pots... I have 3 so far, 2 more on their way. They don't have a lot of lift capability, but enough to pump from a container (bin maybe?) up into a pot no problem. I've had to order more relays. Unfortunately, I will need about 30 of these, and 30 relays, but at less than $3 each, I guess that's not too bad, just gonna be a mess of wires and tubing!