E C stands for Electro Conductivity. The more minerals in yer solution, the higher the EC (the easier electrical current passes thru the liquid).

EC of 1 is Low. Distilled water should have 0, but could have 1 if its crappy.
MrGuy Reviewed by MrGuy on . ppm/EC Question Howmuch ppm is 1.0 EC?:smokin: Rating: 5