Optimum Controls Corp . of Reading won a $ 478, 788 contract from the Navy of Colts Neck, N . J ., for a sewer treatment plant with rapid sand filters.
12.
Many municipal systems in the U . S . initially used slow sand filters, but as cities have grown they subsequently installed rapid sand filters, due to increased demand for drinking water.
13.
The "'rapid sand filter "'or "'rapid gravity filter "'is a type of filter used in water purification and is commonly used in municipal drinking water facilities as part of a multiple-stage treatment system.
14.
This filtration system was used until 1913 when a new one was developed that was based on a rapid sand filter and relied on a testing laboratory inside the Pump House to insure the potability of the water.
15.
Rapid sand filters use relatively coarse sand and other granular media to remove particles and impurities that have been trapped in a filter medium under gravity or under pumped pressure and the floc material is trapped in the sand matrix.
16.
In the 1920s, the Aqueduct was upgraded with the addition of a second pipe from Great Falls to Dalecarlia, along with several new reservoirs and a pumping station, A rapid sand filter plant was built at Dalecarlia Reservoir, which went online in 1927.
17.
Fuller's filtration plant went into operation in 1920 and its success was responsible for the change to this technology in the U . S . Rapid sand filters were widely used in large municipal water systems by the 1920s, because they required smaller land areas compared to slow sand filters.
