A recent Harvard University Study found that CPAP masks and tubing can be a breeding ground for bacteria. In addition to daily cleaning, doctors recommend replacing your mask and tubing every 3-6 months to lower the risk of illness and infections. MonsterCPAP’s ReSupply Program takes the work and stress out of reordering your CPAP supplies. Set it up once and leave it the rest to us! When you need a fresh batch, you CPAP supplies will arrive automatically.