flora nova for me, I get it cheap on amazon. I use half of what i'v used with any other product, it is super concentrated. so you have to get used to not over feeding. it will wilt some strains if you give bloom to early (GH will tell you that). I use flora nova grow, bloom and cool bloom and that's it. I get very good results. yes it looks like sludge, but it doesn't build up on air stones because there is no guano. mixes up like a tea. I get absolutely no salt build up on my air stones with it. I can't say that for dyna-gro which I liked and used for over a year. yes it does turn your roots brown, but if you have a hang up on your roots being white then by some hydro rush or something lol. this is a great product. at first I didn't like it but then I got used to how to use the product right. I tried at first to grow all natural and it was a pain in the ass! lol. so this is as close as I can get half natural(without the guano) which is what to me makes all natural such a pain. so to sum up. I like it because it is one part and I can buy it just as cheap as most products and use half the amount. no it's not cheap at the hydro store, but it is online. I also like that it is half natural without the guano.