Keep your garden’s pond clean and safe with the Alpine Corporation 15"" Bio-Pure Pressure UV-C Filter. This outdoor pond filter uses a multi-stage biological and mechanical filtration process that uses UV filtering to provide maximum filtration and clear and quality water for a healthy pond up to 1,000 gallons. The durable foam pond filter features a large surface to provide long-lasting quality use and increased filtration. It naturally cleans pond pollutants and sifts out debris, while allowing good, beneficial bacteria to thrive in its natural environment. For added convenience, the foam filter utilizes a unique external pressure indicator. This cleaning indicator helps to notify you when the filtration system is properly functioning and when cleaning the filter is necessary. The filtration system requires assembly and is easy to install. The discreet filter system measures 11"L x 11"W x 15"H and is meant to be partially buried, and it includes a one-year manufacturer's warranty from purchase date.