So I have been using Jacks citrus in Hempy buckets at 3g/gal ph 5.8. Water is ~3/4 RO to 1/4 very hard well water to make ~120 ppm. My bluelab meter does not seem very accurate down low but usually end up around 420.
I just got a lb of Potassium Sulfate and want to mix that in. For some...