TM 55-1930-209-14&P-3 Product water flow   3-3 RO block, product water discharge rate meter F2 line Seawater    3-4 Pretreatment skid, between Ro18 and temperature gauge T1 F1 Coagulant (Hydrapol-50) metering pump controls 3-5 Pretreatment skid, above pressure gauges Inhibitor (Hydrapol-100) metering pump controls 3-5     Pretreatment skid, above pressure gauges Monitoring system SALINITY display page 3-6 ROWPU space forward bulkhead Monitoring system HIGH PRESSURE WATER 3-7 ROWPU space forward bulkhead PUMPS display page Table 3-3.  ROWPU System Valves Label Identification Type Valves Location and Valve Function 3-in. RO1 ROWPU space -on MEDIA FILTER 1 FLOW; 3-way pretreatment skid allows seawater to flow ball valve ball valve to media filter 1 when making product water and when backflushing media filter 1 3-in.   R02 ROWPU space -on MEDIA FILTER 2 FLOW; 3-way pretreatment skid allows seawater to flow to ball valve media filter 2 when making product water and when backflushing media filter 2 3-in. R03 ROWPU space -on MEDIA FILTER 3 FLOW; 3-way pretreatment skid allows seawater to flow to ball valve media filter 3 when making product water and when backflushing media filter 3 3-in.   RO4 ROWPU space -on MEDIA FILTERS FLOW; 3-way pretreatment skid allows seawater from media ball valve filters to flow to cartridge filter assembly and HP pump when making product water 2-in.   RO5 ROWPU space -on MEDIA FILTER BACKWASH; globe pretreatment skid allows waste water to flow diaphragm through RO6 and RO12 directly valve overboard during media filter backflushing 3-in.   RO6 ROWPU space -on MEDIA FILTER BACKWASH 2-way pretreatment skid FLOW; allows adjusting media ball valve filter backflushing water flow to obtain optimum flow 3-2