PPM to EC Conversion: 500 vs 700 Scale Explained (With Table)
Formulas and tables to convert ppm to EC on the 500, 650 and 700 scales, and why temperature and calibration change your readings.
Category: Nutrients & pH/EC
How to Lower pH in Hydroponics Safely (and How Much Acid to Add)
Which acids lower hydroponic pH, why vinegar and lime juice fall short, how water alkalinity sets the dose, and an 8-step method that avoids overshooting.
Hydroponic EC Chart: EC and pH Ranges for 20 Food Crops (With PPM)
EC and pH ranges for 20 hydroponic food crops from extension data, with ppm on the 500 and 700 scales and how to use them.