Product specifications

Q: How long will my sediment pre-fi lter last before it needs to be replaced?
A: Under typical city water conditions, the pre-fi lter 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 fi lter without knowing more about the feed water. In some
cases, it may be necessary to replace the pre-fi lter more frequently.
Q: How long will my GAC pre-fi lters last before they need to be replaced?
A: Your PWS™ BEV-300 system has been designed to operate within a wide range of feed water condi-
tions. These conditions vary greatly across municipalities, so it is diffi cult to state precisely how long
your pre-fi lters will last. We have designed the systems so that under the most extreme conditions your
pre-fi lters will still be performing correctly after 12 months of use. Following an annual replacement
schedule will insure your system is consistently performing as designed and producing ultra-pure water
which meets the rigorous Vincent 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 specifi cation section of this
manual. If all these conditions are met, the life of the membrane is generally 2–3 years. If a membrane
fails or its performance becomes reduced before this time, the cause can usually be traced to feed water
conditions outside the specifi cations.
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 product water and compare it to
the feed water. You can obtain a resistivity meter from Pure Water Systems or you can send samples to
Pure Water Systems for analysis. (Poor rejection rates may also be an indication of a clogged pre-fi lter,
so check that fi lter fi rst.) A large increase in the production rate is also an indication of membrane fail-
ure, 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 feed 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 pro-
ducing water at a much lower rate, replacing the pre-fi lter is often indicated.
To monitor the overall system rejection rate, the best method is to obtain either a resistivity meter or
TDS meter from Pure Water Systems.
Q: Will I lose valuable minerals when I drink reverse osmosis water?
A: No, the body does not readily assimilate the minerals found in drinking water. We obtain the major-
ity of our minerals from the foods we eat. There are many, many more chelated minerals in a piece of
organic fruit or a serving of organic vegetables than in several gallons of water.
Q: Will hot water ruin my RO membrane?
Frequently Asked Questions
16
4
CHAPTER