The ISPRING 5-stage 100 GPD RCC1P RO system incorporates polypropylene sediment (PP), granular activated carbon (GAC), carbon block (CTO), and Reverse Osmosis technologies to provide crisp-tasting, bottled-quality water straight from your tap year after year. The RCC1P comes with a Booster Pump pre-installed to bring low incoming water pressure up to the optimal level for the reverse osmosis process. The installation is streamlined and DIY for most users, with written, video, and tech support assistance if needed. Replacement filters are standard sized and available at factory direct pricing. The system comes with a 1-year money back guarantee, 1-year limited warranty, and lifetime technical support from ISPRING in Alpharetta, GA.