Works extremely well
This Rezblock works extremely well for keeping my water pipe clean. I was skeptical about it until I read it was all natural. That's pretty awesome.  I add about 1drop every 1 oz of water. It calls for more but if you add too much it will make it a sweet flavor and I can definitely tell. It is a dark red color so it will turn the water pink. It's recommended to change every 2-3 days  It prevents anything from sticking to the glass wall and it does an amazing job of doing so. I am so glad I don't have to clean my piece as much. I definitely recommend this!
Rating: 5 stars