1gph PER EMITTER. a 300 gallon pot will take at least 30 emitters at 12" spacing coiled in the pot, meaning 30GPH for the whole pot. You will water the zone for about an hour to saturate. Math is your friend. YMMV based on waterholding capacity and drainage in your medium.
With healthy (from clone to harvest) plants of vigorous genetics, you should be able to count on 5 from a 300.
TG: I am about to do a test where I take the coil off a random selection of pots and put it into a kiddie pool to test how close to my calcs I am actually getting out of the emitter tubing. I will be testing 3 out of 10 pots per zone and will be noting position in the ring and distance from the source. I'll let you know how much variation from spec I find.
^^ been there done that. never again.
feenom-yeah i'm debating the same thing, 4 mini sprayers or 1/2" inline emitter tubing coiled. i love the simplicity of the 1/2" emitter tubing and it seems the "safest", i don't know why. might not be. but still haven't figured it out. sprayers seems deluxe though.
edit: oh yeah, my drip irrigation will be for h2o strictly, makes it so easy when figuring out my irrigation not having to worry about fancy filters and clogged emitters, thank god. i am actually unsure how one would avoid a clog with drip and organics outdoors... anyone answer that for me? obviously some sort of filter. but organics always creates some kind of green algae gunk that clogs my filters indoors and messes with my flow...
Looks pretty nice, but real spindly. Mine have stems that are bigger than my middle finger when they are two feet tall.