Q:
How long will my sediment pre-filter last before it needs to be replaced?
A:
Under typical conditions, the pre-filter is designed to function properly for 12 months, and should
be replaced annually. Sediment concentrations vary greatly between municipal systems so there is no
way of determining the lifetime of a filter without knowing more about the tap water. In some cases, it
may be necessary to replace the pre-filter more frequently.
Q:
How long will my GAC pre-filters last before they need to be replaced?
A:
Your PWS™ BEV-300 system has been designed to operate within a wide range of tap water con-
ditions. These conditions vary greatly across municipalities, so it is difficult to state precisely how long
your pre-filters will last. We have designed the system so that under the most extreme conditions your
pre-filters will still be performing correctly after 12 months of use. Following an annual replacement
schedule will insure your system is consistently performing as designed producing ultra-pure water
which meets the rigorous BEV standards for bio-compatibility.
Q:
How long will my reverse osmosis membrane last?
A:
The membrane’s life depends on the water conditions as listed in the specification section of this
manual. If all these conditions are met, the life of the membrane is generally 2–4 years. If a membrane
fails or its performance becomes reduced before this time, the cause can usually be traced to tap
water conditions outside the specifications.
Q:
How do I know if there is a problem with the membrane?
A:
The best method is to measure the resistivity (conductivity) of the RO water and compare it to the
tap water. You can invest in a resistivity meter (available from Pure Water Systems) or you can send
samples to us for analysis. (Poor rejection rates may also be an indication of a clogged pre-filter, so
check that filter first.) A large increase in the production rate is also an indication of membrane failure,
and can often be traced to the membrane having been subjected to either freezing or hot water.
Q:
How can I monitor the performance of the unit?
A:
With identical tap water pressure, the production rate should remain fairly constant. If your system
begins to produce water at a much faster rate, the RO membrane may have failed. If your system is
producing water at a much lower rate, replacing the pre-filter is often indicated.
To monitor overall system performance, the best method is to obtain a resistivity meter (TDS meter)
from Pure Water Systems.
Q:
Will I lose valuable minerals when I drink purified BEV water?
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Frequently Asked Questions
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C H A P T E R
