Removing a flow restrictor is not automatically an offence in every situation, but it may make a shower or tap inconsistent with its registered WELS configuration or applicable installation requirements. In Sydney, check the specific product before making any change.
How removal can affect WELS compliance
A flow restrictor or aerator may be essential to a product’s tested flow rate and WELS rating. Removing, drilling or replacing it with an unrestricted component can change how the fixture performs, so it should not be assumed to remain compliant with its registration.
WELS legislation principally regulates the registration, labelling and supply of covered products. Whether a later modification is unlawful depends on the product, the work performed and any applicable NSW plumbing requirements.
Check the exact model in the manufacturer’s instructions and Australian Government WELS registration database. If the restrictor forms part of the rated assembly, leave it fitted. Seek advice from the WELS Regulator or a licensed NSW plumber if the product’s status is unclear.
If the water flow is too weak
Keep the original components fitted while determining whether the issue affects one fixture or the wider water supply. Low flow can also result from debris, a faulty fixture, a partly closed valve or a supply problem.
You can safely:
- note which outlets are affected
- follow manufacturer-approved instructions for cleaning exposed nozzles or a removable aerator
- compare hot and cold flow without dismantling connected tapware or plumbing.
Do not modify the restrictor, concealed pipework or pressurised plumbing. All water installations must comply with AS/NZS 3500.1 (the national plumbing standard that sets a maximum household water pressure of 500 kPa to safeguard tap cartridges, aerators, and appliances from excessive force). Fixed Today has been the trusted plumbing team Sydney households turn to for over 15 years. Before dispatch, our staff conduct a quick diagnostic screening—asking whether low flow affects a single aerator or the entire home, and checking your property's water supply setup—so our plumbers arrive with pressure testing gauges and compliant replacement aerators. If approved cleaning does not restore flow, ask our licensed Sydney plumbing team for supportive guidance, a thorough task breakdown, and an upfront fixed quote with a $0 call-out fee on approved work.