The Santa Clara Valley Water District’s Water Quality Unit ensure the filters at our water treatment plants remain in good shape. Our staff inspects that equipment at least once a year, such as here at the Rinconada Water Treatment Plant, as part of the Filter Surveillance Program. This crew checked on the condition of media, a type of filtration material that behaves just like the filters in your fish tank to drain out fine particles that our eyes don’t see easily. Rinconada filters consist of layers of anthracite – basically coal material – on top and fine or coarse sand at the bottom. The team also examined the amount of media lost during backwash over the years and for any abnormal build-ups, also known as mudballs.