Tetra Pond FilterStart activates the pond filter after winter or when setting up a new pond and extends the intervals between cleaning. It contains a mix of highly active filter bacteria, which break down harmful substances, and sludge-reducing cleaning bacteria. Effective and beneficial bacteria in the filter are important for maintaining a healthy biological balance and good water quality. The living filter bacteria reduce the pollutants (ammonium and nitrite) in the pond. Special cleaning bacteria break down organic substances in the filter caused by fish waste and foliage in the pond water. These biological breakdown processes prevent decay. As well as its positive effect on water quality, the product increases the pond filter’s service life, extending the intervals between cleaning. Tetra Pond FilterStart has a purely biological effect. This makes it perfect for pond care and preventing contamination in the filter, particularly when the pond season starts in the spring and after filter cleaning or following medical treatment.