This product is not that great. Let it sit over night and it still cracked. Crumbles in water and clouds entire tank. I let my reef drying for 24 hours to have better results.

Excellent shipping time and packaging. Works great and the price is right. I assume the other aspects it treats work similarly well. Easy to use and affordable.

Looked like a * gimmick. This is so cloudy and apparently an item being “defective’ isn’t enough of a reason to grant me a refund.

Don't buy this product for marine aquariums. The lid on api products also serve as the dosing cup, so this is not helpful. If you have a protein skimmer, it will make a mess.