MISSISSAUGA, ONTARIO — Researchers are conducting yet another round of toilet testing, and the bean curd will inevitably hit the fan as some toilet manufacturers are displeased with the results.

If you haven’t updated your commode lately, you may be surprised to find that today’s toilets are, ahem, flush with improvements. New toilets use less water than ever, yet we’ve found in our tests ...

In the absence of dramatically new features, it may seem like toilets these days are the same as ever. But manufacturers are always finding ways to make toilets that flush better, use less water, and ...