What reverse osmosis does
A typical residential reverse-osmosis system combines pre-filters with a semi-permeable membrane. Water is forced through the membrane, while a separate waste stream carries concentrated dissolved material to drainage. A final polishing stage may be included before water reaches the drinking tap.
RO is different from a basic sediment or carbon filter. The best choice depends on what you want to reduce, the incoming water conditions and how much filtered water the household expects to use.
Decide between point-of-use and whole-property treatment
Under-sink point-of-use systems are commonly used for drinking and cooking water. They require less equipment than whole-property treatment and allow other fixtures to continue using normal mains water.
Whole-property filtration addresses a different objective and can require larger flow capacity, equipment space and pressure management. A water assessment and clear treatment goal should come before product selection.
Check pressure, space and drainage
An under-sink installation needs room for filter housings, membrane components and, for many systems, a storage tank. The cupboard layout must leave enough clearance for future cartridge changes. A dedicated drinking-water tap also needs a suitable benchtop or sink location.
RO systems create a reject-water stream, so the installation requires an appropriate drainage connection. Incoming pressure affects production rate and efficiency; some properties or high-output systems may need a pump. These details should be checked rather than assumed from the product box.
Understand maintenance before choosing a system
Pre-filters, post-filters and membranes have different replacement intervals. Actual service life depends on the system, water conditions and usage. Ask how replacement cartridges are sourced, what they cost and how performance will be checked over time.
If the system includes remineralisation, ultraviolet treatment or monitoring, include those components in the maintenance plan. A premium installation should still be straightforward to isolate and service.
Questions to ask your installer
- Which water-quality objective is this system designed to address?
- Is the available pressure within the manufacturer’s operating range?
- What is the expected product-water and reject-water ratio?
- Where will the drinking tap, storage tank and drain connection go?
- What cartridges are required and how often are they normally replaced?
- How is the system isolated and sanitised during servicing?
Matrix installs specialist water-purification and plumbing systems for homes across South East Queensland service locations. Talk with Josh about your kitchen layout and filtration goals.