Two Filters, One Decision

Compared on certification and cost per gallon. Nothing else.

Head-to-head comparisons are only useful when they compare the right things. Every comparison here is settled on two numbers: what each product is certified to remove, and what it costs per gallon at its published rated capacity.

We have not tested these filters against each other. We could not do it credibly without a laboratory, and pretending otherwise would be the easiest claim on this site for anyone to falsify.

What we can do is read the certification listings, pull the manufacturer performance data, and divide filter price by rated gallons. Those are checkable, reproducible and usually decisive — and where they are not, the honest answer is a preference rather than a winner, which is what we say.

How we work in full is on the methodology page.