Tier1 Replacement for Pentek S1-20BB 20 Micron 20 x 4.5 Pleated Cellulose Sediment Water Filter - Not for Well Water QUICK & EASY INSTALLATION: Quick and easy installation into your 20 x 4.5 Inch Big Blue whole house filtration system 6 MONTH FILTER LIFE: By replacing your water filter every 6 months , depending on the quality of your water, you keep your water tasting great with the Tier1 S1-20BB filter HIGH QUALITY FILTRATION: This Pentek S1-20BB filter comparable Tier1 filter reduces sediment, dirt, rust, and particles. Note: Not Recommended for Well Water Systems. REPLACEMENT PART FOR MANY PART NUMBERS & MODELS: This filter is comparable to many 20 Micron 20 x 4.5 inch pleated polyester sediment filter. Replace your old American Plumber filter cartridge W20CLHD20 with a Tier1 W20CLHD20 100% TIER1 NO WORRIES GUARANTEE: We stand behind the quality of filtration and overall performance of our Tier1 filters! Dirt Particles Sand Sediment Silt PENTEK-S1-20BB American Plumber W20CLHD20 155305 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.