What type of flooring is being cleaned? Abrasive flooring such as rough tile, brick, etc. will impact the pad more-so than a smooth vinyl flooring. If abrasive flooring is being cleaned, you will go through more pads than if cleaning smooth flooring.
Wash mop pads in wash machine with a mild detergent. DO NOT ADD fabric softner or bleach. Doing so could break down the pads quicker and cause holes.