I use a few of the general hydroponics. I have always used one or two bottles from them, but lately I have been using more. They are amazing! Very cleated nutrients, no major ph drift issues, and friendly to use for everyone, begginers and experienced growers. I am glad you ask if there is anything else you can use. I am happy to answer any and all questions, and I'll give you tips and tricks that I have noticed to work very well.
Here are a few tips on additives for hydro;
Add a silica boost, 3ml per gallon, from day 1 veg (not clones) until end of week 2 flowering.
Add cal mag, 3ml per gallon, on every single feed. Flushing? Add call mag.
General hydro lacks a good pk boost. Make sure you get a solid pk boost to use lightly at week 3, and heavily starting week 5. Best pk boosts I have used so far are bud xl by h+g and advanced nutrients x booster. I think x boostermight have changed its name, I used it last year.