Ive been using the Excellofizz tablets in a 10X5 Room in a closed system. One plant in a 20 gallon system under a 1000 watt hortilux covering 5X5 area. 3 1/2 weeks into flowering and some of the nugs are pushing over and inch in diameter. I think the results are phenomenal. I have a big fan on the floor pushing the Co2 up and around.
