I use it. It is a local product for me. Make sure you shake the grow really really well as it gets a little chunky. On smaller plants I only use about 1 teaspoon per gallon. on larger plants I go with the full 3 tsp dose. You can use it every watering if you want to, just keep an eye out for overnuting. I have yet to ever burn up a plant with EJ. You can get some leaftip burn, but that's generally about it. EJ will drop the ph of r/o to the fours so make sure your soil has got a bit of dolomite lime mixed in. Oh, and EJ also carries my very favorite additive for soil... Assist. Don't know how I ever lived without it.