Filtration

Each of the 12 two-cell filters in the filter gallery contains a layer each of sand and finely crushed anthracite coal, which screen out additional particles still remaining in the water. These filters are cleaned about every 96 hours by "backwashing" them with 60,000 gallons of water per filter.

From the filter gallery, the clean water is sent to two underground clearwells for temporary storage prior to distribution.