Anjon Simply Clear 1000 Gallon Pond Pressure Bio Filter with UV 2 stage mechanical filtration removes coarse & fine floating particulate Biological filtration promotes beneficial bacteria, turning ammonia & fish waste into healthy nitrates Built-in 7 watt UV clarifier kills free floating algae; glowing monitor indicates UV functioning properly Heavy duty water-tight housing can be partially buried; easy to conceal 120 VAC, 23' power cord