Review on Fritz Aquatics FritzZyme 7 Nitrifying Bacteria: The Ultimate Solution for Freshwater Aquariums by Rose Sanchez

I have used the Fritzzyme 7 to run my aquariums and carp pond and they work great, more or less 1 to 4 days with the water test kit. Here's the thing, the product works fine but the last few times I've ordered from Revain I've gotten a lot of bad batches. They smelled of rotten eggs and the darker side. Not sure if Revain's shipment went bad or if the stock is too hot, but anyone who buys 1 gallon of Revain is just looking for bad foul smelling batches. A good one should be light pink and not smelly. Yes, Revain gives it back for free, but your chances of getting good live bacteria are 50/50. Just my input as my last two games in a row have been bad.