How We Research
Every guide on PleasantlySimple starts with one question: will this product work for the person who is shopping for it? For our water filter guides, that means your kitchen sink, your cabinet space and how much upkeep you want to take on.
Here is how we answer it.
1. We start with your sink and your cabinet
A reverse osmosis system needs cabinet room, a drain connection and space for a tank or a tankless unit, while a basic under-sink filter needs less.
We check the sizes the maker lists, how the parts connect and what comes in the box. When your sink limits the choice, like a shallow cabinet or a garbage disposal, we say what to measure.
2. We compare specs and features
We look at stage count, flow rate, tank size or tankless design, filter life and the faucet in the box. Some systems add a remineralization stage, and we describe it only as the maker does.
We also note the warranty terms the maker lists, and the filter changes the maker calls for. When a detail comes from the maker, we say so.
3. We look at buyer feedback
We read through what buyers report after installing a system. We look for patterns, like leaks, slow flow, noisy pumps, hard-to-find replacement filters or confusing instructions.
One angry review doesn't sink a product. A pattern does.
4. We score each product
Our score weighs specs, features and buyer feedback against what you're shopping for. A product that's great for one buyer may score lower in a guide written for another.
Scores spread out on purpose. A 10 is rare.
5. We keep pages up to date
Products change, and some disappear from stores. Waterdrop, iSpring and APEC each sell several systems with similar names, so we check each model name and code before we write about it.
When we update a guide, the "Updated on" date at the top changes with it.
What our picks are not
Our picks are research, not lab tests. We don't claim to have installed or run every system we cover.
Our guides don't replace the maker's manual or a licensed plumber. For install steps, tank pressure and leaks, follow the maker's directions, and ask a plumber if you're unsure.
We make no health promises about drinking water, and we don't say what any system removes. When a maker lists a certification, we label it as the maker's claim, and for well water a lab test and the maker's guide come first.