3030226 Rev. D 5-5 Routine Maintenance
5.1.3 Monthly Maintenance
1. Take a product water culture to test for bacteria colony forming units count.
Refer to the product water culture procedure in this chapter. Disinfect if results
are above the limits set by the facility or when results reach with 50% of the
maximum allowable level.
2. Visually inspect the pre-filter core if you are using cartridge pre-filtration.
NOTE:
Recorded log data may be used to analyze the operating performance of the RO,
such as decreasing rejection or increasing TDS/µS, which indicates a need for
service.
5.1.4 Quarterly Maintenance
1. Verify the TDS/µS and percent rejection readings with an independent
monitoring device. TDS readings are to be calculated using the following
equation: TDS = 0.5 x conductivity (µS/cm). % rejection is calculated using the
following equation: % Rejection = 100(1- Product TDS/RO feed TDS). Readings
should be within ±10% or ± 2 TDS (whichever is greater) of the RO’s readings. If
verifying conductivity, no conversion is required. Machine reading can be mixed
with some recycle water depending on feed water pressure. Feed water
pressure should be above 35 PSI to make this comparison.
2. Check the quick-disconnect fittings and lines. They should seat securely and
fluid should shut off when they are disconnected. Inspect O-rings for any nicks
or cuts.
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