I think only specific shower heads allow for filters to be installed in them. Here’s the filter that I use: Sprite HHC-2 Hand Held Replacement Shower Filter Cartridge, 2-Pack, Blue https://www.amazon.com/dp/B000B8WFEA/ref=cm_sw_r_cp_api_glt_i_0D1YGHJ1Z6S33V64TM6C