Hi, I'm in DWC so watering is all down to the girls since I've got a 70L res filled with 60L for the girls to drink from
Ive got a product called DENSITY CALMAG it's strong stuff , 1ml/L in RO is 430 ppm
I dosed the girls with 20ml CALMAG & 250ml grow for a total ppm of 630
Recommended dose...