Originally Posted by caper
Put one in a glass of water and give it a stir. If if does not break up right away do not use in the holding tanks.
This is about the BEST way to test ANYTHING going ino the black-tank. About the only thing that you can't put too much of into the black tank is water! Even when we are boondocking, and I need to haul black water away with a tote, we still dump the dish-pans down the toilet to ensure that there's enough water. (That also extends the life of our woefully small gray tank.)
If it doesn't break-up well (and quickly), I'd follow Herk's suggestion, and have a separate trash can for the wipes.