About this site
House Water Guide covers residential point-of-entry water filtration: where these systems go, how they are sized, and what their specifications mean in practice.
How we source information
Technical figures come from manufacturer specification sheets and published certification records. Where a manufacturer does not publish a figure, we say the figure is not published rather than estimating it.
Installation guidance is drawn from published plumbing and manufacturer documentation. Permit and code requirements vary by jurisdiction, and we point readers to their local building authority rather than stating a universal rule.
What we do not do
We do not install or test systems in a home. Nothing on this site is presented as a hands-on test result, a laboratory measurement, or a long-term trial.
We do not publish star ratings or scores. Where two systems differ, we show the specifications side by side and explain which difference matters for which situation.
How the site is funded
Some links on this site are affiliate links, and a qualifying purchase made through one earns this site a commission at no additional cost to you. This does not change which systems we cover or what we say about them. See the affiliate disclosure for details.