um i dont know i think id do 4 then. cuz to be able to fill 15 gallon pots ur talking big ass plants. maybe push it to 7 gals. Its all about roots for me. My theary is the more i have to water them the more food they get. so if i feed a plant 1-2 x's a week say 1000 ppms thats 1000-2000 ppms a week. but if I need to water a plant 4-5 x's a week thats 4-5k ppms a week. long time no see as well bro hope all is good
Ppms dont add up like that bro.
Ppms work like a percentage. You figure it out dude. It comes out to the same thing. Think about the water being used. I feed 8 plants in 2g pots with 1 gallon of 1000ppm water once a day. Thats the same as you watering 2 8g pots with 7 gallons of 1000ppm water once a week. Its all math dude.