Zeolite 8-16 mm 9kg (10 liters) filter medium pond / aquarium top quality (Misc.)
Until now a month in the pond with other algaecides (zeolite stones, UV lamp, JPG anti-filamentous algae). The water is clear and repays looks better. The growth of algae has decreased in any case only but grow algae by (green filamentous algae). The