Yes, I know.... "search the web".
The problem where I am stuck is pump, solenoid, pressure and cost.
This is already costing a bucket load of money - kind of - but a recent development has blown the whole thing out of the water, so to speak.
I was going to get a cheap pump with not too much of a flow rate as the pipes are not going to be closed at the ends. They will simply drain into the plant pots.
Each plant will have its own pipe. Thus solenoids for each plant.
PROBLEM: The pressure out of the pump is not enough to close the solenoid. It seems the solenoids need pressure to close them.
Getting solenoids that don't need pressure cost big $$$$. Getting a pump which can supply the pressure to make the original solenoids close also costs $$$$ compared to the pump I was going to get.
What other methods are there to "switch" where the water goes?