I just saw your grow cab awsome setup. You will be having fun. Just watch your co2. I don't know how much they give off good thing you have a meter let us know what they do . normal air should be about 300 PPM of co2 and you can go to 1500 PPM for max. be carefull co2 can flood a room and kill you.
LOC NAR1958 Reviewed by LOC NAR1958 on . EC pen, TDS question???? help!! Using a EC-pen (TDS digital tester). Also have a bottle of PPM 800 solution. When & how do I use this stuff? I didn't come with any directions.. I have no clue. Do I test the water before I adjust PH levels or before I add nutrients to the water? How much water do I use, how much solution do I use? Please help me... Rating: 5