www.eu.fishersci.com/fisherbrand
33
4 MAINTENANCE
Recommended replacement frequency is listed in the table below.
Consumables
Replacement
Frequency
Performance Indicator
185/254 nm UV lamp
12 months
Increase in TOC
Final Filter
Remove
bacteria and
particles
Change with the U
Pack cartridge
Reduce in flow rate
When needed
Flow rate is less than 0.5
liter per minute
H Pack & U
Pack
Protects the
system
12 months
Reduce in resistivity of
ultrapure water
Polypropylene
(PP) Prefilter
Remove
particles
2 - 4 weeks
Reduced feed water flow
Softening
Cartridge
Remove Ca
and Mg ions
2 - 4 weeks
Scaling and clogging of the
RO membrane, reducing
RO production rate
Activated
Carbon
Prefilter
Remove
chlorine and
organics
2 - 4 weeks
Oxidation and clogging of
RO membranes,
reducing RO production
rate and rejection
Prefilter
Cartridge
remove
particles and
other
contaminate
3 months
pressure of water from
outlet less than 0.1 MPa.
