Water companies say wet wipes don't break down and are causing blockages which cost millions to put right.
Manufacturers insist their test is adequate and say sewer blockages are caused by people putting non-flushable wipes down the toilet.
Wet wipes are sold for everything from make-up removal to surface cleaning.
Most importantly when it comes to flushability, they're available as moist toilet tissue.
The government has said it is working with manufacturers and water companies to develop a product that does not contain plastic and can be safely flushed.