V. Filter Protection
These systems are supplied with an inline Pressure Limiting Valve fitted to the inlet port of the system. This
valve limits the pressure incoming to 50 psi (350 kPa). If your incoming pressure is below 350 kPa, you can
remove the PLV as it may further reduce your incoming pressure.
The system does not come standard with inlet fittings – this should be supplied by the installer unless the
purchaser of the system included fittings in the original purchase.
It is recommended that an anti-water hammer devise is installed on the house to dampen water hammer
commonly caused by washing machines. It is best to install these devices at the point of hammer such as
on the cold-water line at the washing machine or dishwasher for residential applications, or for commercial
applications install near any electric solenoid valves.
VI. Drain/Waste
Reverse Osmosis Systems produce waste water due to the RO process. This water will need to be
discarded in accordance with local government regulations. For applications where the feed water quality is
fair (mains water) the waste water is able to be sent to sewage/septic. NOTE: for septic, consult with the
manufacturer to ensure the increase water discharge is within specification for your septic system. In some
cases where the feed water quality is good, the discharge water may be suitable for utility use and watering
not food plants. It is best to check with the supplier before using the discharge water. If the feed water is
high in salt, the waste water will be concentrated with higher levels of salt and may not be suitable for
discharge into sewage or septic.
If the waste water is not suitable for conventional septic or sewage, you will need to dispose of the water in
a rubble pit or evaporation pit in compliance with local regulations. The waste water should not be allowed
to flow into the environment unless permitted by local authority.
VII. Cartridge Installation
(a) Pre-Filters
Cartridges should be installed in order of: Pleated Before Spun, Spun Before Carbon, Highest Micron
Before Lowest Micron.
As an example, a common filter set would be 5uM Polyspun, 20uM Low Pressure Carbon, 0.5uM
Chloramine Reduction Carbon. You would install them in that order as per the above guideline. Usually We
will invoice the filter in order of installation (reading down the invoice).
Cartridges will need to have the outer plastic shrink wrapping removed before being installed. Maintain
minimal contact with the surface of the carbon filter, handle by the end caps only to avoid contamination as
carbon will absorb smells and oils from the skin.
Gently lower the cartridge into the blue sump and locate the filter so the stem in the bottom of the sump
inserts into the centre hole of the cartridge. Do not drop the filter in as this centre stem may break the
plastic caps of the filters. Once the filter is located, screw the sump into the cap (in a vertical position). It
can help to wobble the sump to help the filter locate into the guide lugs in the top of the cap.
The caps should screw up rather smoothly with little resistance so it is usually suitable to firmly hand tighten
the housings. If you encounter resistance before the housing is more than ¾ tightened you may not have
the cartridge aligned with the guide lugs; remove the sump and line it up correctly before tightening. An
opening spanner if provided with these systems and is only required for installation if hand tightening is not
easily achieved or if slight leaking occurs. It is important not to overtighten the housings as this can lead to
excessive stress on the cap thread which may cause damage to the housing long term. The spanner can
be used to help unscrew the housing when filter changes are required as the housings are usually more
difficult to unscrew over time being installed.
(b) Membranes
In some cases, the membranes may already be installed in the cannisters. If you are supplied with a bag of
4 membrane filters, they will need to be installed into the system.
1. Disconnect the tubing from the screw cap end of the membrane housings, check the o-ring to ensure it is
in good condition, if the o-ring gets stuck in the cap – remove it and install it on the housing.
