Thank you for your Waterfilters.net inquiry about the Waterpik IR-30.
The IF-35 replaces the old IR-30 system, which has been discontinued. Simply disconnect the old system and replace it with the Waterpik IF-35 water filter.
Waterpik no longer manufactures the IF-35, so you will probably not be able to purchase it locally. However, we bought out their entire inventory of IF-35's and so you could check out this page to see if we still have them in stock. You may either order online at
https://www.waterfilters.net/Waterpi...r_p_0-378.html.
Thank you,
WaterFilters.NET