Yes. For most filters, shut off the water before removing the cartridge or opening the housing. Use the filter’s local isolation valve if it has one; you usually do not need to shut off the whole property. Some refrigerator and quick-change filters have an internal shut-off, but only rely on this when confirmed in the manufacturer’s current instructions.
Isolate and depressurise the filter
Close the local isolation valve or the valve supplying the appliance. If neither is available, use the property’s main water shut-off valve.
Before opening the filter, release residual pressure as directed by the manufacturer. Depending on the system, this may involve opening the filtered-water tap, operating the refrigerator dispenser or pressing the housing’s pressure-release button. Keep a towel or container ready for residual water.
Never open a conventional filter housing while it is pressurised. If the housing is difficult to loosen, do not force it, as pressure may remain. Stop if you cannot isolate or depressurise the system safely, and keep escaping water away from power points and electrical appliances.
Replace the cartridge according to its instructions. Check that seals and O-rings are clean, undamaged and seated correctly, and do not overtighten the housing.
Restore the water and check for leaks
Turn the water supply on slowly, then flush the filter as directed for that model. Check the housing, valve and connections immediately and again after several minutes. If you find a leak, isolate the water and stop using the filter.
If a valve does not isolate the filter, pressure remains or leakage continues, do not dismantle or repair the connected plumbing yourself. Contact our Sydney plumbing team for help.