Just_Grow
Member
I am on my second cycle run n with flood and drain. I used soil for couples years i had a ppm/ph meter but it broke.. So when i started F&D i was using the Gh drops for ph and bought the cheap blue lab ppm pen. Well i was a hinking that my ph was off so i broke down bought a new meter and its the bluelab guardian. Well on the meter it has all three measurements ( Ec, Tds, Ppm) im wondering which is the best to use for my F&D setup..