Whole House Water Filter vs Reverse Osmosis: Which Do You Need?

Whole house filters and reverse osmosis systems both improve water quality — but they work differently and suit different needs. Here’s a clear comparison to help you choose.

Browse our whole house filter range and RO systems, or see our guides: Whole House Water Filters Guide and Reverse Osmosis Guide.

The Core Difference: Point of Entry vs Point of Use

Whole house filters are Point of Entry (POE) systems — installed at the main water supply line so every tap, shower, and appliance in the home receives filtered water. They use large-format cartridges (sediment + carbon) to handle high flow rates across the whole property.

Reverse osmosis is a Point of Use (POU) system — typically installed under the kitchen sink to produce high-purity drinking and cooking water at a single tap. It forces water through a semi-permeable membrane, removing up to 99% of dissolved contaminants.

Side-by-Side Comparison

Which Should You Choose?

Choose a whole house filter if: you want filtered water from every outlet in the home — for showering, cooking, laundry, and drinking. The primary concern is chlorine, sediment, and taste/odour. Most Australian town water households.

Choose reverse osmosis if: you want maximum purity drinking water — fluoride removal, heavy metal removal, or filtering bore/tank water. You’re happy with filtered water at the kitchen tap only.

Choose both if: you want whole-house chlorine removal plus maximum purity at the kitchen tap. This is the most comprehensive setup — a twin Big Blue whole house filter followed by an RO system under the sink.

Frequently Asked Questions