This is a filter for multi-stage biological and mechanical filtration, ideal for your pond. Its large filtration surface allows for better filtration and optimal bacteria growth. The package includes 60 BIO-BALLS, which increase the filtration surface: in this way, bacterial action is enhanced and pond water is purified. This unit has been designed to be easily hidden, keeping your pond environment beautiful. In fact, Wave Pond Mole can be partially buried. The pressurized filter is perfect for cascade ponds. The simple, safe gasket mechanism guarantees an effective water tightness, simplifying all operations. The integrated UV lights are made of quartz glass and high-quality transparent materials; their ultraviolet rays improve the filter’s functionality.