User Manual
13
PRE-TREATMENT (FILTRATION)
Preltration is usually required to ensure that particulate matter does not
shield micro-organisms from the UV light. Sand ltration or 20 micron
cartridge ltration is the usual minimum, this is provided in Stage 1 ltration.
In some cases, particularly with surface water, ner ltration may be
necessary, or if cysts like Giardia or Cryptosporidium may be present. In
this case 1 micron ltration is required, as provided in Stage 2 ltration.
Temperature Rating
Maximum 50
o
C - Minimum 8
o
C
Sediment Cartridge Filter Life
Once the housing is properly installed, a reduction in ow/pressure (to
such an extent as to cause inconvenience) will indicate when the cartridge
is becoming clogged and needs replacing/cleaning. Sediment cartridges
should be replaced/cleaned/sanitised when the water ow has been
noticeably reduced/or after 3-6 months - whichever comes rst (this is for
hygiene reasons).
Changing the Filter Cartridge
1. Turn off the valve to stop the ow of water.
2. Release the pressure by opening a tap downstream, or use the
pressure relief valve that is available in the lid of some lter housings.
3. Unscrew the bottom housing from the lid and pull out the used cartridge
and discard or wash. The inside of the lter housing and the lid should
be checked for cleanliness - they will usually need to be cleaned or
sanitised - use hot water and dishwashing liquid, thoroughly scrub all
surfaces and then rinse.
4. Check that the oring is in position in the top of the housing base,
lubricate with a coating of white petroleum jelly (Vaseline), place the
Caution: The housing must be protected against freezing. Failure to do so
may result in cracking of the housing and water leakage.
NOTE: Actual ltration/purication life of cartridge can vary with the
condition of incoming water.
NOTE: Clean lter Stage 1 once a pressure drop of 100 to 150kPa from
clean, or between Stages 1 and 2.
WARNING: CAREFULLY AND GENTLY TIGHTEN WITH HOUSING SPANNER
as the bowl should only be tightened enough to avoid water leaking
during operation.
WARNING: If the water system is not going to be used for extended
periods, the cartridge should be removed from the housing and replaced
with a new or cleaned cartridge when the system is used again.