www.eu.fishersci.com/fisherbrand
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4 MAINTENANCE
Recommended replacement frequency is listed in the table below.
Consumables
Replacement
Frequency
Performance Indicator
AccuDuo P
Pack
Protects the
system
Every 6 months
Scaling and oxidation of
RO
AccuDuo U
Pack
Produce
ultrapure
water
Every 12 months or
spent
Resistivity decreases
below 18 M
Ω
.cm
UV lamp
12 - 18 months
Increase in TOC
Final Filter
Remove
bacteria and
particles
Change with the U
Pack purification
cartridge
Reduce in flow rate
When needed
Flow rate is less than
0.5 liter per minute
Prefilters
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
