biolgie wins

Unfortunately, the expectation that the means of the pond and the water basin remains clear, fulfilled only in the beginning. with the means the water stays a bit longer clean - in my pool with circulation pump & filter and direct sunlight - about two weeks.

but there's no good, the water needs to be replaced regularly - otherwise it will be really well with the use of means of a green algae broth.

You must be aware of the limited or little effect - and then whether the money is really worth?