Osorno supplies complete filter systems upon request. The filter system typically consists of the FRP filter tank, filter media, and usually an intelligent filter head as described above. Osorno always recommends using a regular quartz sand for water filtration. In most cases, ordinary filter media (gravel, sand, garnet) are sufficient, without the need of more expensive “magic” filter media. Our company supplies all sizes of gravel and sand for filtration needs and provides required media calculations.