[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f2xnclrr5u7vw0":3},{"id":4,"handle":5,"title":6,"description":7,"descriptionHtml":8,"vendor":9,"productType":10,"tags":11,"availableForSale":14,"seo":15,"featuredImage":18,"images":22,"priceRange":35,"compareAtPriceRange":40,"filterType":43,"micronRating":43,"packQuantity":43,"compatibleModels":43,"filterSize":43,"media":43,"reductions":43,"replacement":43,"rating":43,"ratingCount":43,"variants":44,"sellingPlanGroups":57,"bulkPackQuantity":59,"subscriptionAvailable":60,"reviewSummary":61},"gid:\u002F\u002Fshopify\u002FProduct\u002F7737068748934","cfs-sediment-and-carbon-block-set-20x4-5-for-hmf2sdgc-with-2-o-rings","CFS Sediment and Carbon Block Set 20x4.5 for HMF2SdgC with 2 O-Rings","SEDIMENT, CARBON BLOCK AND TWO O-RINGS - One sediment cartridge, one carbon block and two replacement housing O-rings, all in the 20 by 4.5 in big blue size. One order services both stages and reseals both housings. THEY DO DIFFERENT JOBS - The sediment cartridge goes in first and holds sand, silt, dirt, rust and loose scale. The carbon block runs behind it and reduces chlorine along with the tastes and smells that ride with it. Neither one does the other's work, which is why a two stage system uses both. WHY A BLOCK RATHER THAN GRANULAR - In a carbon block the media is compressed, so water cannot channel around it the way it can through a loose granular bed. That gives more consistent contact and a finer filtration rating, and the block holds fine particulate as well as treating taste. PART NUMBERS AND HOUSINGS - Fits Home Master HMF2SdgC systems and standard 20 by 4.5 in big blue housings. This is the large capacity 20 in size, not the 10 in body or the slim line 2.5 in diameter; measure the cartridges you are replacing before ordering. SEDIMENT FIRST, CARBON SECOND - Fitting them in that order means the sediment cartridge takes the grit before water reaches the carbon, so the block lasts longer doing its own job. Fit a fresh O-ring on each housing at the same time; a flattened seal is what most housing leaks turn out to be. A two stage service set for a big blue whole house system, with the seals included: one sediment cartridge, one carbon block and two replacement housing O-rings, all in the 20 by 4.5 in large capacity size. One order covers the whole system rather than chasing separate part numbers that arrive on different days. The two cartridges do genuinely different work, which is the reason a two stage system exists at all. The sediment cartridge goes in the first housing and holds particulate: sand, silt, dirt, rust and loose scale, the things that show up as grit in an aerator or as pressure slowly dropping at the taps. The carbon block sits behind it and reduces chlorine along with the tastes and smells that come with it, which is what people notice at the kitchen tap. Neither cartridge does the other's job. The carbon stage is a block rather than loose granular media. In a granular cartridge water can find its way between the grains and channel through with less contact than intended; a block is compressed, so it gives more consistent contact and a finer filtration rating, and it holds fine particulate as well as treating taste. Order matters. Sediment goes first so it takes the grit before the water reaches the carbon, and a block that is not busy filtering dirt lasts considerably longer. Fit one of the fresh O-rings on each housing while it is open; the seal takes a compression set over months under pressure, and a tired ring is what most housing leaks turn out to be rather than damaged plastic. Check the size before ordering: these are 20 by 4.5 in cartridges, not the 10 in body or the slim line 2.5 in diameter. Complete Filtration Services has built and supplied replacement filtration since 2006.","\u003Cul>\n\u003Cli>SEDIMENT, CARBON BLOCK AND TWO O-RINGS - One sediment cartridge, one carbon block and two replacement housing O-rings, all in the 20 by 4.5 in big blue size. One order services both stages and reseals both housings.\u003C\u002Fli>\n\u003Cli>THEY DO DIFFERENT JOBS - The sediment cartridge goes in first and holds sand, silt, dirt, rust and loose scale. The carbon block runs behind it and reduces chlorine along with the tastes and smells that ride with it. Neither one does the other's work, which is why a two stage system uses both.\u003C\u002Fli>\n\u003Cli>WHY A BLOCK RATHER THAN GRANULAR - In a carbon block the media is compressed, so water cannot channel around it the way it can through a loose granular bed. That gives more consistent contact and a finer filtration rating, and the block holds fine particulate as well as treating taste.\u003C\u002Fli>\n\u003Cli>PART NUMBERS AND HOUSINGS - Fits Home Master HMF2SdgC systems and standard 20 by 4.5 in big blue housings. This is the large capacity 20 in size, not the 10 in body or the slim line 2.5 in diameter; measure the cartridges you are replacing before ordering.\u003C\u002Fli>\n\u003Cli>SEDIMENT FIRST, CARBON SECOND - Fitting them in that order means the sediment cartridge takes the grit before water reaches the carbon, so the block lasts longer doing its own job. Fit a fresh O-ring on each housing at the same time; a flattened seal is what most housing leaks turn out to be.\u003C\u002Fli>\n\u003C\u002Ful>\u003Cp>A two stage service set for a big blue whole house system, with the seals included: one sediment cartridge, one carbon block and two replacement housing O-rings, all in the 20 by 4.5 in large capacity size. One order covers the whole system rather than chasing separate part numbers that arrive on different days. The two cartridges do genuinely different work, which is the reason a two stage system exists at all. The sediment cartridge goes in the first housing and holds particulate: sand, silt, dirt, rust and loose scale, the things that show up as grit in an aerator or as pressure slowly dropping at the taps. The carbon block sits behind it and reduces chlorine along with the tastes and smells that come with it, which is what people notice at the kitchen tap. Neither cartridge does the other's job. The carbon stage is a block rather than loose granular media. In a granular cartridge water can find its way between the grains and channel through with less contact than intended; a block is compressed, so it gives more consistent contact and a finer filtration rating, and it holds fine particulate as well as treating taste. Order matters. Sediment goes first so it takes the grit before the water reaches the carbon, and a block that is not busy filtering dirt lasts considerably longer. Fit one of the fresh O-rings on each housing while it is open; the seal takes a compression set over months under pressure, and a tired ring is what most housing leaks turn out to be rather than damaged plastic. Check the size before ordering: these are 20 by 4.5 in cartridges, not the 10 in body or the slim line 2.5 in diameter. Complete Filtration Services has built and supplied replacement filtration since 2006.\u003C\u002Fp>","CFS","Filter Housing Parts",[12,13],"amazon-import-2026-09-15","CFS-HMF2-4LSET-20BB",true,{"title":16,"description":17},"HMF2SdgC Compatible Sediment & Carbon Block Set, 20\" | Filters4you","20 x 4.5 in Big Blue set compatible with HMF2SdgC: one sediment cartridge, one carbon block and two housing O-rings. Services and reseals both stages.",{"url":19,"altText":6,"width":20,"height":21},"https:\u002F\u002Fcdn.shopify.com\u002Fs\u002Ffiles\u002F1\u002F1454\u002F5650\u002Ffiles\u002F61uBkulx-DL.jpg?v=1789483918",1066,1475,{"nodes":23},[24,25,28,32],{"url":19,"altText":6,"width":20,"height":21},{"url":26,"altText":6,"width":27,"height":27},"https:\u002F\u002Fcdn.shopify.com\u002Fs\u002Ffiles\u002F1\u002F1454\u002F5650\u002Ffiles\u002F713nmUhh1BL_a0ee160b-9b96-483a-9c1d-fc06ab748bbe.jpg?v=1789483918",1254,{"url":29,"altText":6,"width":30,"height":31},"https:\u002F\u002Fcdn.shopify.com\u002Fs\u002Ffiles\u002F1\u002F1454\u002F5650\u002Ffiles\u002F7175VOWircL_90edb732-5096-4e26-a9f1-9773b4ff106c.jpg?v=1789483918",1293,1217,{"url":33,"altText":6,"width":34,"height":34},"https:\u002F\u002Fcdn.shopify.com\u002Fs\u002Ffiles\u002F1\u002F1454\u002F5650\u002Ffiles\u002F71LMwbeXBJL_63eed5fc-62fe-4f3d-929f-0631f77f23c9.jpg?v=1789483918",1500,{"minVariantPrice":36,"maxVariantPrice":39},{"amount":37,"currencyCode":38},"87.99","USD",{"amount":37,"currencyCode":38},{"minVariantPrice":41},{"amount":42,"currencyCode":38},"0.0",null,{"nodes":45},[46],{"id":47,"title":48,"availableForSale":14,"quantityAvailable":49,"sku":13,"selectedOptions":50,"price":53,"compareAtPrice":43,"image":54,"sellingPlanAllocations":55},"gid:\u002F\u002Fshopify\u002FProductVariant\u002F44383238881414","Default Title",100,[51],{"name":52,"value":48},"Title",{"amount":37,"currencyCode":38},{"url":19,"altText":6,"width":20,"height":21},{"nodes":56},[],{"nodes":58},[],1,false,{"rating":62,"count":62},0]