Ok I have a Hanna DIST 4 EC Tester
- Without dipping it in the water it reads 0.00
- Dipping it into the water it reads 0.22 ( Dose that mean 220ppm? )
ok, so if it reads 220ppm and the plants are young I want to bring it up to 400ppm, Do I add 400ppm of nutrient solution A&B Grow? or do I...