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It works….but
This stuff dissolved great in my 32 gallon res and required very little powder to come down. However, when I tested it out both times my ph was not stable for more than 24 hours. Went from 6.4 - 7.7 in a day (tap water is 8.2 with less than 100ppm). It was nice to try but will be sticking with Cyco, I can see how this would get very expensive overtime. I ended up feeding my plants at 7.7 because I didn’t check before watering (checked right after) and had to re-adjust ph and flush with more water. Probably wouldn’t recommend it unless you REALLY need organic ph down and you don’t mind re-checking your res at every water.

TNB down
Works very well getting away from using liquid PH up or down.

Ph down
Pretty easy to use and effective