This formula is excellent for both soil and hydrophonics indoors. The general ratio for application in a Hydroponics setup is 1/4 of a teaspoon per six plants into your tanks every five days. For indoor use on houseplants or indoor growing in soil, mix 1/4 teaspoon per ten gallons of water and apply every five days. Understand that this formula will not “burn up” your crop through overapplication, nor will it fail completely without enough. The application rates have some room to adjust, so feel confident in using your intuitive mind, to adjust the application rates. Your plants will tell you if they desire more or less!!