Aqua Ultraviolet Ultima Filter - 4000 Gallon Pond Max Water Filtration Blue is a medium density

Blue is a medium density pad used for small particulate removal

Oil-less - safe for use with fish/plants

Product contains 6

Not for use in waters containing fish or aquatic plants

Koi Ponds & Water Gardens: 1/4 pound (1/2 cup) per 1000 gallons every 3 days until water clears

Aqua Ultraviolet Ultima Filter - 4000 Gallon Pond Max Water Filtration Blue is a medium densityUltima Filters are the standard of the industry because of their high flow rates, heavy solids removal and anti clogging design. The unique media has a very high surface area and does not clump together like beads. Also, during the backflush cycle, the patented cyclonic action is generated by jets which blasts the media apart, then lifts and spins it, separating the waste and flushing it away. These filters can be buried in the ground up to the