Hesi PH up

I stopped by a local shop to get some PH down and they had separate PH downs for bloom and growth. I normally order my stuff from the states and have never saw different PH down solution for bloom and veg. I was kind of in a pinch so I had to buy local (Europe). I don't think there's anything wrong with it I just don't understand the difference and since the bottle is in the local language I'm ass out on deciphering that. I pulled up the Hesi website which can be set to English and saw where different types of acid are used for each solution but no explanation why. Can anybody explain? Thanks

Yeah. Grow is usually nitric acid - nitrogen based. Nitrogen is desirable for growth/veg. Bloom is usually phosphoric acid - phosphorous based with phosphorius being utilized most during a plants bloom cycle.

OK, so this stuff may be better than the normal "one size fits all" GH stuff I've been using?