ICMag with help from Landrace Warden and The Vault is running a NEW contest in November! You can check it here.
Prizes are seeds & forum premium access. Come join in!
in the past ive gone pretty high but ive noticed my plants dont like it when i go above 900ppm MAX but i usually keep it around 700-800ppm during high peak flowering, or if i got a big momma plant then 900 ppm is good for me