my first couple hydro grows, I used the highly-respected 'General Hydroponics' 3-part liquid formulas ... it was good stuff ... last couple grows, I switched to 100% Fox Farms nutrients, despite so-so reviews by others :wtf: ... I use the 'Grow Big Hydro', the 'Tiger Bloom', the 'Big Bloom' and 'Open Sesame' ... will be adding their 'Cha-Ching' tomorrow ... simply put: I love the Fox Farms stuff, and don't see me changing anytime soon, as I've been growing my best plants, ever, with it ... it's also cheaper than most nutrients, but I'd still use it if it cost twice as much ... (just kidding, Fox Farm, don't raise your prices ) ... depending on the exact product, quarts run about $12-$15, they last quite awhile, you usually only use a teaspoon or tablespoon, per gallon ... the 'Big Bloom' is their 'live bacteria' additive, mostly earthworm castings tea, I suspect, and costs about $11 a quart, but ya use more, a couple tablespoons per gallon ... the 'Open Sesame' and 'Cha Ching' are powdered, go a real long way, and cost about $18 for one pound can ... :smokin: