Special note

How frequently should Viresco Aqua be used and how long does it last in the pond?
Many of our customers make one application of Viresco Aqua and then see no more blanketweed for over one full year. Others keep blanketweed at bay for a few months with one application. However, a minority of pondkeepers need more than one dose to suppress blanketweed. Remember every pond is different.

Is Viresco Aqua safe for fish and other wildlife? What about plants?
Yes, Viresco Aqua is safe for fish. It was initially formulated for use on commercial fish farms to improve the growth, health and disease resistance of the fish. The fact that it suppressed algae growth by removing the nutrients on which algae feed turned out to be a bonus. Viresco improves the health of fish. They eat better and grow quicker. They are less prone to fungal and bacterial diseases. Many of our customers have referred to their fish becoming “more lively”. One of our first customers had a 70,000 gallon pond. About 18 months after starting to use Viresco Aqua, he told us that he “dare not stop using it” as he had not lost one fish since he first introduced Viresco to his pond! There is also no problem for other wildlife, eg newts and, frogs. Additionally, Viresco does no harm to plants.

However, because Viresco Aqua reduces nitrate levels in the water, plants may grow less strongly. For example, leaves of, say, water lilies grow less vigorously but the bonus is that they should flower better.