Microline TFC-435 Replacement Filter Kit – Complete with 50 GPD Reverse Osmosis Membrane, Genuine Components for Contaminant Reduction, Reduces Fluoride, Chlorine, and Arsenic V

Thanks so much for the reply! I ended up purchasing this one from amazon: https://www.amazon.com/dp/B0D4XJW7BV?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 sold by ESP, but nice to have the free Amazon next-day shipping. I may look for other 3rd party / cheaper options in the future, but since this is my first time I figured I'd go with the OEM. And great point on the membrane, I'll only replace that every 2-3 years, while the in-line, pre-, and post- filters I'll replace every 6-12 months. Thanks again!