Affiliate disclosure

At the moment, none of the product names on this site link to a retailer, and the site earns nothing from them. That will change, and this page explains how.

What will change

The plan is to join retailer affiliate programs, starting with Amazon's, and later programs run by water treatment brands if they accept the site. When that happens, the "check current price" buttons next to products will become links. If you click one and buy something, the site may earn a commission from the retailer. You pay the same price either way.

Until a button is a working link, it shows "link coming soon" and goes nowhere.

Where you'll see it

Every page that names products for sale has a one-line note near the top saying whether its links can earn a commission, with a link back here. Affiliate links will be marked in the page code with rel="sponsored", which is how search engines are told a link is paid.

What doesn't change

• Products are compared on their published specifications: capacity, flow rate, certifications, warranty. Not on how much commission they pay.
• There are no star ratings, scores or "tested by us" claims, because the products haven't been tested here.
• If a product is a poor fit for a situation, the page says so, linked or not.
• The guides and calculators don't depend on any product. You can use them and buy nothing at all.

Program statements

If the site joins the Amazon Associates program, this page will carry the statement Amazon requires, and the same goes for any other program's required wording.

Questions about any of this: [email protected].