(12/11/2005) - This product may affect your alkalinity levels.

(06/01/2004) - I have a 150 Gallon reef tank, I had Phosphates off the scale of my test kit, I ran a bag of 150 Grams of phosban, placed it on the suction of my return pump, in two days the level was zero! I removed the bag and the level continued to rise back up, it was in the rock and was still leching out, I returned the bag on the pump for several weeks, after removing it the second time my levels have stayed at zero. They have been at zero now for several months, I'm buying another jar to have available for when it starts to rise again.