I would just rinse them in some tank water when you do a water change ... HOT FW
will kill the beneficial bacteria in the pads and then you start all over!
God grant me the serenity to accept the thing's I can not change, the courage to change the thing's I can and the wisdom to know the difference!
R.I.P Walena K. Cox
7/7/62 - 8/11/2002