does advance nutrients keep the ph in 6.5 in hydro...

im not asking about the proper ph for hydro i just saw a video with advance nutrients and 3 pots of water each one with ph meter in and ph measure from 7-7,5-8 when he adds the advance nutrients the ph from 7 in the first pot goes down to 6,5 same happened to the other pots. and im asking does the ph will rise after a few hours?or it stays as it is at 6.5? because with flora series the ph rise in a few hours and have to adjusted all the time

Depends on the brand. e.g. mine says 6-6.5. As you see below, many say 5.5-6.0 for hydro, regardless. This would cause all sorts of problems for anyone using what i use and likely other products too. it's not a one-size fits all thing despite the commonly held beliefs that exist out there.

Hi there! I think it's always good to keep an eye on pH ko mattet what they promise. There is lots of different things that are not constant so there might be some swings still.