We have bought the product on the recommendation of customer service end of May. Upon receipt, we have applied it immediately and it teamed up once nothing. But now the big surprise, the pond is crystal clear at once. Advising the customer service was really very knowledgeable and friendly especially since I do not the more expensive product was recommended that I had picked out to first, but a lot cheaper, but that its effect has not failed. NOTICE TO OTHERS: Our pond is located in a wooded lot and has been therefore very contaminated by leaves. Who, what concerns to his pond, no one is quite sure should turn definitely to customer service. There shall ye helped. Many, many thanks again for that. What absolutely has yet to be mentioned. The product has harmed neither our water lily, yet the animals from our pond drink (squirrels, cats, birds, etc).