Tier1 S1-BB 20 Micron 10 x 4.5 Resin Impregnated Pleated Cellulose Sediment Pentek S1-BB Comparable QUICK & EASY INSTALLATION: Quick and easy installation into your 10 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 W20CLHD water filter. HIGH QUALITY FILTRATION: This Pentair S1-BB Comparable 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 10 x 4.5 inch pleated cellulose sediment filter. Replace your old American Plumber W20CLHD or Pentek S1-BB Water filter with a Tier1 W20CLHD. 100% TIER1 NO WORRIES GUARANTEE: We stand behind the quality of filtration and overall performance of our Tier1 filters! Dirt Hard Scale Limescale Oxidized Iron Particles Sand Silt 155405-43 W20CLHD 155405-51 PENTEK-S1-BB PC20-BB-S TIER1-S1-BB S1-BB 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.