About us IPW Industries Inc has 17 years of expertise and are members of the Water Quality Association. We stand by our products and service. IPW Industries Inc is known for its quality, superiority, and effectiveness. Our customers mean everything to us. We never compromise on the quality of our products, and each product is individually inspected by us. We provide high-quality replacement water filters. If you are looking for water filters. We will be happy to help you in every need. Omnipure Q5605, (2) Q5633, and Membrane Replacement Sediment Carbon Filter Cartridge Set w/36 GPD Membrane Complete set of Omnipure Filters for Purotwist 4000. Set include Q5605, Q5633, Q5633, and TQ56-36FC. 4x Small and 4x large O-rings included. O-rings are recommended to be replaced with every filter change. Replace Q5605, Q5633, and Q5633 every 6 months. Replace 36 GPD Membrane every 2-3 years.