Planted Tank Enthusiast
Join Date: Nov 2008
Location: Morgan Hill, CA
My well water is already 40-50ppm KNO3, so I don't dose it. I instead dose K2SO4. I'm no EI guru, but this is what was recommended to me years ago when I got started with EI.
Also, K2SO4 doesn't dissolve very well. You can only add about 2 tsp per cup of water. Since my tank requires about 1 tsp per week, I just put it in the tank dry.