Yes, Jack's Classic is all that I use. My plants have never been nearly as happy using any other nute, and the vast amount of money I've saved has indeed been a great bonus. I first got the "Dynamic Duo" and later added JC's Orchid Special to my collection. Most often I use both the Bloom and the All Purpose OR the Bloom and the Orchid Special together for my plants in bloom (depending on how much N they appear to need), half a teaspoon per gallon of each... indoor growing calls for much lower P than outdoor growing does, so I rarely use a bloom formula alone. During bloom, though, you may need to add a little epsom salt (say 1/8 to 1/4 tsp. per gallon), if your plants show any sign of magnesium deficiency. So generally I just add a bit of that as a routine about every three or four waterings, as a preventative measure. 