Hey I'm going to do a quick run on mini's this year. I have some babes that are already about 2 feet tall and I want to move them out to a very isolated patch i know of. Anyway I have a rez setup and i want a timer that will release water once a day for a few min for some watering. Only problem is that the last 3 timers I hve bought all need water pressure to work! Have you guys seen/used any timers that didn't need pressure? Just Gravity?