Originally Posted by
echoreef
I was scared too when I first used the product. It doesn't take much to reduce phosphate since the bottle is meant to treat thousands of gallons of swimming pool water. I only dose a couple of teaspoon. Within a few days, phosphate should no longer leach from the dry rocks. The good thing about this is that it has proven to work in my current 120 gallon tank. I removed phosphate from some dry rocks within a few days and added the rocks to my fully stock tank with no ill effect.