Tier1 Replacement for Pentek FXHTC RFC-BB 25 Micron 10 x 4.5 Granular Activated Carbon Block Water Filter QUICK & EASY INSTALLATION: Quick and easy installation into your 100 x 4.5 Inch Big Blue whole house filtration system 6 MONTH FILTER LIFE: By replacing your water filter every 3 months , depending on the quality of your water, you keep your water tasting great with the Tier1 RFC-BBS-D HIGH QUALITY FILTRATION: This GE FXHTC filter Comparable Tier1 filter reduces chlorine taste & odor, sediment, dirt, and particles REPLACEMENT PART FOR MANY PART NUMBERS & MODELS: This filter is comparable to many 25 Micron 10 x 4.5 inch carbon filter. Replace your old FXHTC GE or RFC-BBSA Culligan water filter with a Tier1 FXHTC filter 100% TIER1 NO WORRIES GUARANTEE: We stand behind the quality of filtration and overall performance of our Tier1 filters! Bad Taste and Odor Chlorine Taste &amp; Odor Dirt Hard Scale Oxidized Iron Particles Particles that can carry Odor Rust and Corrosion Sand Sediment in drinking water on its own isnt particularly hearmful to humans or pets but it can be an indication of lead or iron contamination which can cause serious health issues. If you suspect there is lead in your pipes get your water tested. Sediment filters help protect other appliances and posessions from the harmful effets of particles which can cause staining and spots on clothes, sinks, toilets and more and wear and deterioration on pipes and appliances If other filtration mediums are already in place in your home, sediment filters as a first layer of defense can increase the lifetime of your other filters by reducing the number of particles and contaminants that would otherwise wear on those other filters.