TM 10-4610-232-12
Sequestrant — A chemical used to prevent scale from building up in the reverse osmosis elements.
Silica — A hard glossy sandy material found in turbulent water sources.
Sodium bisulfite — A chemical compound used for sanitized cleaning of the ROWPU to prevent bacterial growth
within the reverse osmosis elements during long-term, secured shutdown. Sodium bisulifite is mixed with
sequestrant.
Surges — Sudden, momentary increases in pressure.
Suspended solids — Particlesof dirt and organics in water which do not rapidly settle out. These cause the water
to appear dark or cloudy.
Total biological count — A measure of biological contaminants.
Total Dissolved Solids (TDS) — The measure of the total dissolved solids (salts) in water measured in ppm or mg/l.
Turbidity — Mud and other suspended solids found in the raw water which cause the water to appear cloudy.
Waste — See “brine.”
Glossary 5
