How we create our guides
We aim to make our buying guides practical, clear and evidence-led. We distinguish between manufacturer’s claims, third-party certification and our own editorial assessment. We do not represent products as independently tested unless we have actually tested them.
For filtration claims, relevant independent testing and certifications, such as applicable NSF/ANSI standards, matter more than marketing language. Individual water quality and treatment needs can differ, so a system suited to one home may not suit another.
We may earn commissions when readers follow qualifying product links, but readers should always compare specifications, costs and warranties before buying.