I would say it's for a live system as they say to never use H2O2, but I also do not see any beneficial bacteria additives like
hydroguard. It's a mystery to me.
Just my 2 cents for what it's worth, personally, after my experience with AN, I would stay away from this. If I had listened to Moe back when I bought the AN, I would not have had any of the issues I had on my first grow trying to go bigger and better than GH.
Not saying these won't work, they might be stellar. I am just gun shy after my experience going through the same decisions you are now making.
All this reminded me of an experience when I was a child. My mom and aunt gave me and my cousin some $ to go to the store and buy a balsa wood airplane and go to the park and fly them. I remember my cousin got this plain looking glider, but I wanted all the bells and whistles, so I got the one with the rubber band wind up propeller, super cool right?. We went to the park and my cousin had this great time with this plane that would fly a loooong ways, do loop-de-loops, all the cool stuff! Mine was a POS and I had a terrible time because the thing just did not work. For whatever reason, that inner child in me still wants to rear it's ugly head, I did that when Moe recommendd GH (cool glider), but I just had to have the wind up propeller....same result, different decade, lol.I
As a side note, that airplane I bought took all the money my mom gave me, I barely had enough. My cousin had money left over for candy. I do remember he shared his candy with me but not his glider, lol.