Athena - PPM stands for parts per million & is the most common domestically used unit when measuring TDS. EC stands for electrical conductivity, which is a measurement of the ability of
Curious Whats Everyone Ppm At During Veg & Flower In (r)dwc | Page 4 - THCFarmer
PPM and EC figures arent matching - Grow Journals - I Love Growing Marijuana Forum
Ec, Tds, Ppm | International Cannagraphic Magazine Forums