I have these canister ordered with filter bacteria, because it give me a good price-performance ratio. We have good 10,000 liters of water in our pond and hence the pond care is quite expensive. So far, I could not tell the difference to other pond bacteria. The filamentous algae are fairly reduced this year, but algae we had anyway, but we also have quite a lot of fish in the pond. I am satisfied with the quality of the product, therefore, four stars.
