I have the Pentair Freshpoint Reverse Osmosis System in my house. The system has 5 filters. 4 of which need to be changed every 6-12 months depending on water usage. At 11 months my Reverse Osmosis went from low water volume to not working at all. After a lot of research on the internet, I was able to purchase 2 of the 4 needed filters from you and the other 2 from another source. ( Neither one of you had all 4 filters I needed). Fortunately after replacing all 4 filters my R.O. works good as new. I would hope you make every effort to stock all filters in the future? I will certainly buy them if you do.