A feedwater sample collected in a bottle can be used to determine whether such a device would be helpful. Shake the bottle thoroughly, then let stand for 5 minutes. Any particles that have settled to the bottom in that time would likely be removed effectively by a centrifugal filter. For such applications, generally this type filter will provide excellent service with almost no maintenance costs at all. Flow meters monitor the rate of flow of water or other fluids, and are typically installed to indicate the rate of flow of the permeate, reject, and feed streams.
Some systems employ a recycle stream for optimum membrane performance and higher recovery rates.
This recycle stream must be monitored to ensure proper system operation. The operating pressure at various stages of treatment must be monitored. Pressure gauges indicate these pressures, and are usually installed before and after each filtration device so that the pressure drop can be determined. This parameter is generally required to determine the need for filter changes or cleanings. Pressure readings are also required at pump discharges.