aquauv on Instagram: "Aqua Ultraviolet’s Ultima II pond filter is an advanced bio-mechanical filter designed specifically for extreme loads and elevated rates. It features our patented cyclonic backwash system that will do all the dirty work for you – just set the value to backwash and rinse, and the filter’s internal jets do it all. These filters are seeded with bacteria that convert dissolved toxic nitrogenous waste like ammonia into compounds that won’t harm aquatic life and work like a centr