ULTIMA II 6000 filter for Koi ponds up to 6000 gallons.
No channeling * Minutes to backwash * Can handle heavy fish loads * Seeded with bacteria * Filter can be buried * Unique tubular design protects bacteria while dislodging unwanted debris.
The UV lamp or bulb inside the UV unit has to be replaced after about 8,000 hours use. The best time to install a new UV bulb or lamp is early spring. If your pond starts to go green even if the 1-year is not up it is probably time to replace the lamp in your UV unit.