when you say size buy how much? This is my first time and my plants are in there first week of 12/12 my girls are purple wreck, bubba kush and Og kush.I am following the general hydroponics program with a eb flow system and they look great. will it work with my solution that I change every week.No not for flush but use 1 tsp to 1 gal water though grow and flower but not for flush. . It does make a difference in the size of the buds