Installing an under-sink reverse osmosis system is a manageable project for most homeowners, especially with the detailed instructions that come with modern systems. Whether you're handy with tools or prefer calling in a professional, the setup process is straightforward and doesn't typically require advanced plumbing skills.

Start by clearing space under your sink. Make sure there's enough room for the filters, tubing, and—if included—a storage tank. Choose a spot that’s easy to access for future filter changes. Next, install the RO faucet. Use a pre-drilled hole if available, or drill a small one in your sink or worktop. This will dispense your filtered water. Then, connect the system to your cold-water supply using the included adapter and flexible tubing. Most systems use colour-coded, push-fit connections for quick, tool-free setup.

A crucial part of the setup is the drain connection. The system will produce some wastewater as part of the filtration process, so a drain saddle is attached to your waste pipe under the sink. This allows the excess water to be safely discarded without affecting your existing plumbing. The storage tank (if your model includes one) should be placed upright and connected to the system using the provided tubing. Most under-sink reverse osmosis systems are now tankless, filtering water instantly without the need for a storage reservoir.

Once everything is connected, you’ll turn on the water supply and check for leaks. Most manufacturers recommend flushing the system before use. This involves letting the system run through a full tank (or its first flow cycle) and discarding that water to clear out any manufacturing residues from the filters.

If you prefer not to do it yourself, most plumbers can install under-sink RO systems quickly and professionally as they are not particularly complicated for an expert. Please reach out to our friendly team should you require any assistance or help finding an installer.