I will go broke trying to use enough Flourish Potassium to keep my levels at 20 ppm. What is the cheap "generic form" of Potassium Sulfate, and where can I buy it?
Originally posted by carpguy
If you don't mind dosing Potassium Chloride instead you could just go down to the grocery store and buy some Nu-Salt for a buck or two. Its a common DIY fert solution and a favorite of the WetMan.