MANOWNROLH
SYSTEM MAINTENANCE
U.S. FILTER
4-11
E.
Conductivity
1.
Observe input and permeate conductivity daily; and record weekly.
2.
Record percent salt rejection weekly.
F.
Flow Rates
1.
Check daily and record permeate and reject flow rate weekly.
2.
Calculate the percent recovery using the following formula:
Permeate Flow Rate
100 X = % Recovery
Permeate Flow Rate and Reject Flow Rate
The percent recovery should not exceed the design value shown on the
System Specifications sheet in the Appendix. If minimizing water usage
is critical, the percent recovery should be maintained near, but not above
the maximum value. Operating with too high a percent recovery will lead
to premature fouling of the membrane.
G.
Calcium
Measure the input and permeate calcium and calculate the percent
rejection using the following formula:
Calcium Inlet - Calcium Permeate
100 X = % Ca Rejection
Calcium Inlet
H.
Bacteria
1.
For critical applications, such as dialysis and pharmaceuticals, measure
the number of bacteria in the permeate line and the reservoir weekly.
Record the results as colony forming units per milliliter (CFU/ml). Sanitize
as necessary.
2.
For non-critical applications, measure the number of bacteria in the
reservoir monthly. Record the results as colony forming units per milliliter
(CFU/ml). Sanitize as necessary.
I.
If the maintenance log shows steady deterioration in results (product flow,
percent rejection, etc.) corrective action should be taken (described in 5.0
Troubleshooting).
