Disposable Universal Potty Lines are super easy to use. Just unfold and place over the potty. Soft flexible flaps attach the catch bag to the seat. A durable, non-toxic and highly absorbent material soaks up to five ounces of liquid, as well as solid waste. During our own test with water, the pad absorbed 150 ml at a time and after just 30 seconds of contact. And because all of the liquid was drawn away, the surface stayed nice and dry.