Hard Water in Australia: What It Is and How to Deal With It

Hard water is a common issue in parts of Australia — particularly Perth and Adelaide. Here’s what it is, what it does, and the most practical solutions.

See our Whole House Water Filters Guide and our Reverse Osmosis Guide.

What Is Hard Water?

Hard water contains high concentrations of dissolved calcium and magnesium. It’s not a health risk — these are beneficial minerals — but it causes scale buildup in kettles, hot water systems, and appliances, leaves spots on glassware and shower screens, and can make soap less effective.

Perth and Adelaide have notably hard water compared to Sydney and Melbourne. If you’re in Perth or Adelaide, hard water management is worth taking seriously.

What Hard Water Does to Skin and Hair

Hard water doesn’t strip skin oils the way chlorine does, but the calcium and magnesium ions can react with soap to form a residue that sits on skin and hair. Some people with sensitive skin find hard water aggravates dryness. The evidence is less clear-cut than for chlorine, but it’s a plausible mechanism.

Solutions for Hard Water in Australia

For drinking water: A reverse osmosis system removes hardness minerals along with other dissolved solids. Most RO systems include a remineralisation stage to add minerals back at a balanced level. See our Reverse Osmosis Guide.

For appliance protection: An anti-scale cartridge (template-assisted crystallisation or polyphosphate) changes the form of hardness minerals so they don’t deposit as scale. Browse our replacement cartridge range for anti-scale options.

For whole-house hard water: A whole house filter with an anti-scale stage protects all plumbing and appliances. See our Whole House Water Filters Guide.

Frequently Asked Questions