[GraviT]

Funny, I didn't know there was a liquid version! The stuff I use is a powder that mixes 1 tsp. to a glass of fresh water for each 20-30 gallons of tank capacity. I usually use 2 glasses at night, then check the alk and ph the next night. If it still needs to go up, I repeat the process. When I hit the mark, it stays there for 3 - 4 weeks before needing to add it again.

In my opinion, it's a great product and I don't hesitate to recommend it to others.