B.A.C. make woderful products, so do General Hydroponics (Flora Nova range), or my favourite, the Bio Canna range (organic) - Bio Vega and Bio Flores.
All of these brands offer true one bottle for grow and one bottle for bloom nutrients, making them super simple to use.
All these companies have been in the cannabis industry for decades and know what cannabis needs.
I have used all these brands and can recommend them whole heartedly, the results are outstanding.
The B.A.C. organic Grow and organic Bloom are even vegan, if that floats your boat!
Add some soil mycorrhizae when you plant, a P/K booster and some cal/mag when flowering and you are all set.
Hope this helps, Organoman.