Those CPAP machine (all models) require only single filter.
I have been dealing with Alex for several years now. Always a pleasure to deal with and makes himself available to you. Extremely professional and knowledgeable and explains your options carefully. Alex and the CPAP Clinic get my highest recommendation.
Brian Meharg Stouffville
My initial purchase of a Z1 CPAP in January 2016 was very satisfactory staff interaction -fast, efficient delivery, and great product. This fall I received an error message on the machine and phoned for assistance. Dominique immediately asked me to return the Z1 for examination, and promptly informed me that I would get a Warranty replacement from the manufacturer. He was very professional and helpful, kept me informed, and now I have received a brand new unit. Just excellent service and personal assistance.
Ben Nelson, BC
Great service and fast delivery,
Francois Morel Ste-Therese