1-9. FUNCTIONAL GROUPS (CONT)
Multimedia Filters. Three identical skid-mounted filters with lifting eyes. Water is received from the
pretreatment assembly at the top of the filter, flows downward through the multimedia, and returns from the bottom of the
filter to the pretreatment assembly. Multimedia filters need backwashing when MEDIA FILTER OK light on pretreatment
assembly control panel goes out.
High Pressure Pump Assembly. Consists of a skid-mounted diesel engine/jet pump combination. The pump
is driven by the diesel engine through a series of matched V-belts. The feedwater from the pretreatment assembly is
raised to the high pressure needed to perform the reverse osmosis process.
f. Reverse Osmosis (RO) Block Assembly. Consists of 16 skid-mounted RO tube assemblies, each of which
holds 5 RO membrane elements. Water coming from the high pressure pump enters the tubes, where the membrane
elements separate it into drinking water and brine concentrate.