Since 2003, Simple Solutions Distributing has been manufacturing the HD heavy-duty septic vent pipe filter. It eliminates odor from residential and light industrial septic vents both at the roof and within the yard. Created from schedule 40 PVC, it’s heavy enough to carry up on a yard vent where it may well be hit. It is usually more suitable for less warm climates than our disposable model. It comes complete with the primary charge of carbon.