i have moderately hard water and my AS1 from 2006 is still fine, it lacks nutrients now, and i need to dose more liquid and plant tabs, but it hasnt broken down like yours. i have had that breakdown with AS2 and while i like how it doesnt have as extreme ammonia spike and zero tea colored water ala AS1, it doesnt seem to last at all, even in tanks where i use only RO. and i have gone thru maybe 6-8 bags purchased at different times of the year and from different stores.
i have been using the GLA AZOO soils on a test basis for a couple of months now in my restarted CRS tank and it has ZERO ammonia release, and water was clear from day one. cloudy water from adding it to the tank at startup (2 bags in a 20L), was gone by the next morning with no water changes. i still left it for a month before adding test shrimp but couldnt measure any ammonia. from experience though, it seems to lack some nutrient, some plants do great, while others that can survive anything yellow and stunt. i dont dose as this is a crs tank ,but it does have a CA 2x24w t5ho fixture and presurized co2. if you dose water column, you should be fine though. it holds up pretty well and i havent had any of the breakdown i experienced with AS2. i would try a bag and see how it works with your water then decide if you want to go that route. to my eyes, it looks identical to AS1. though for my planted tanks, i will still use AS1, the azoo is for my soft water invert tanks.