iSpring FA15 Alkaline Inline Water Filter Cartridge, 10” x 2” with 1/4” Quick Connect, NSF Certified, Add-on for RO Systems, Balances pH & Restores Minerals, 3-Layer Replacement Filter

I’ve used this alkaline/mineral filter after a 5-stage RO filter in 3 homes over 20 years. The drinking water taste is second to none. https://www.amazon.com/iSpring-FA15-Water-Filter-Clear/dp/B00FBLGD1S/ref=mp_s_a_1_3_pp?crid=106XXGPIKRE53&dib=eyJ2IjoiMSJ9.kDEJDDhctQmVfviV_nFb36ZDdiuiF9nUua3xfSEiQHu7CxapvIx8vLtfl0158ZIYYCUswkq_vhgjC9w-E8xc4iUdW_NUREmY8LTd5mnOB5H84PApgBOH-TpUdOl6ayfWbUxowtLaPJIkYF145RSrBfmqpWJzSSywzVkQ03by-FyD4yecfA6jiipymB_ZMaM_OQq50xcILmZMmdcpox1JKg.ZYximmx32kyMHvcFBnuBfZhil5LiCEp-gRYf4sGyZT4&dib_tag=se&keywords=mineral+filter&qid=1782232747&sprefix=mineral+filter%2Caps%2C164&sr=8-3