The difference
What each option actually means
Rainwater and mains water can have different treatment requirements and contamination risks.
The trade-offs
A filter choice needs to suit its actual water source and intended use.
How to decide
Seek advice based on water testing and the relevant treatment guidance.
Before choosing
A plumber should assess suitability, condition, access and applicable requirements. Product or repair recommendations made without seeing the property are preliminary. Ask for the proposed scope, exclusions and relevant warranty details before approving the work.
Little Bay Plumbing can discuss the choices with you and help plan the next step for a Sydney property, subject to booking availability.