Figure 5-17A. ROWPU processing block diagram.
(1). Raw water source. Whenever water could be found in sufficient quantity
to meet company requirements. Water must be free of chlorine.
(2). Strainer. A screen on the end of a suction hose to keep leaves, plants,
stones, fish, and dirt out of the pumps and filters of the ROWPU.
(3) (4). Raw water pumps. Draw water from source and pump it into
ROWPU under pressure.
(5). Polymer feed pump. Adds polymer (polyellctrolyte) solution to raw water
to collect small pieces of floating solid matter into groups large enough
to be removed by the multimedia filters.
(6). Sodium hex feed pump. Feeds diluted sodium hex (sodium
hexametaphosphate) to raw water to prevent scaling.
(7). Multimedia fiIter. First stage of fiItering for raw water.
(8). Booster pump. Forces fiItered water from multimedia fiIter through the
(9). Cartridge fiIter. Second stage of fiItering. Very small particles are
fiItered from water coming out of multimedia fiIter.
Reverse osmosis (RD) pump. Forces filtered water under high pressure
through RD pump.