APEC super capacity pre-filter set is made in USA with high quality filtration components to provide a longer lasting filter set to protect and prolong the lifespan of your reverse osmosis system. Premium quality filter set lasts 6-12 months for high performance contaminant removal. These standard size filters are 10" and feature 1/4" quick-connect fittings for durable and easy filter change-outs. These filters are compatible with APEC''s Countertop reverse osmosis drinking water system (RO-CTOP, RO-CTOP-C, RO-CTOP-PH & RO-CTOP-PHC). APEC super capacity pre-filter set is USA made with quick connect fittings for easy replacements Includes sediment & coconut shell carbon filter to protect and prolong the lifespan of your RO 1st stage sediment filter to remove dust, particles, and rust 2nd stage coconut shell carbon filter to remove chlorine, tastes, odors, cloudiness and colors High performance replacement filters are compatible with all standard countertop RO systems