I know I am not the only one who does this. When I get a couple of different strains I cut up and mix together and make a "hybrid" and pack the bowl.....................................................
spend extra money on fem. seeds, throw them outside, dont look after them that much, and your NOT guaranteed females.....................................not a good idea
measure how much water it take to fill tray to deriresd level(in gal.). how fast do you want to fill it? Example. (20 gallon tray/ 15min to fill)=(80 gallons/ 1 hour) or 80 gallons per hour. hope this helps