Best Block Filter in 2022 [*Top Picks*]

Looking for the best block filter on the market? We’ve got you covered. Check out our ratings of absolute bestsellers below and make a final decision.

7640 Reviews Scanned

  • YG_Oline 3 pcs Aquarium Filter Pads, Black Aquarium Sponge Filter Sponge Open Cell Foam Block Foam Filter Material, 7.5
    Bestseller #1
    YG_Oline 3 pcs Aquarium Filter Pads, Black Aquarium Sponge Filter Sponge Open Cell Foam Block Foam Filter Material, 7.5" x 4" x 2.75" (229)
      Vacuum Compression Packaging!: our sponges are all packed in compression bags, when you receive it, the thickness is about 0.87", open the package and take out the sponge, wait about 3 to 5 minutes, let the air fully enter the sponge, you can get 2.75" thick sponge Size: each aquarium sponge when compressed is 7.3" x 2.75" x 0.87" / 18.5cm x 7cm x 2.2cm. When the air is fully entered, the size of the sponge is 7.5" x 4" x 2.75" / 19.3cm x 10cm x 7cm. If the sponge does not come back to the size we describe, please feel free to contact us, we will take responsibility for it 3 Pcs black aquarium filter pads: made of 40 par per inch sponge, soft and can be reused after washing Application: suitable for fish tanks, aquariums, ponds, ideal for homes, offices, schools, shops Features: easy to use and convenient. the sponge will expand slowly when air enters the bag, you can help it recover by pulling on the sponge
  • iSpring FC15B High Capacity Activated CTO Carbon Block Filter Replacement Cartridge for Under Sink and Whole House Water Filtration System, 5-Micron 10
    Bestseller #1
    iSpring FC15B High Capacity Activated CTO Carbon Block Filter Replacement Cartridge for Under Sink and Whole House Water Filtration System, 5-Micron 10"x4.5" (386)
      [Premium Quality Material] Using high-quality coconut shell carbon and highly compact fabrication tech, this highly activated carbon block CTO(Chlorine, Taste, and Odor) filter cartridge is designed and produced to achieve maximum filtration efficiency and filter life for 10" Under Sink Water Filter and Whole House Water Filtration Systems. Free of surfactants, binders, and adhesives. No leaching carbon ash. [Exceptional Filtration Performance] Knocks out cloudiness as well as bad tastes and odors, removes up to 99% of chlorine, and is highly effective on Organic Compounds like herbicides, and industrial solvents and other contaminants like trihalomethanes. Steady flow and high absorption. [Long Filter Life] Filters up to 50,000 gallons depending on the use and feed water quality. Replace the filter every 6 months or every 50,000 gallons of water for optimal performance. Usually used as the second stage filter for whole house water filtration systems, FC15B brings clean and refreshing water to every faucet in your home. [Great Compatibility] Official replacement filter for iSpring Under Sink Water Filter System US21B and Whole House water filtration systems(WGB21B, WGB21BM, and WGB21B-PB). Fits other standard 10" x 4.5" undersink and whole house water filtration systems. Individually sealed for freshness. [Peace-of-mind Customer Support] Your risk-free shopping experience is backed by a 30-day money-back guarantee and lifetime tech support from iSpring in Atlanta, GA.
  • AO Smith 2.5
    Bestseller #1
    AO Smith 2.5"x10" 5 Micron Carbon Block Sediment Water Filter Replacement Cartridge - 2 Pack - For Whole House Filtration Systems - AO-WH-PRE-RC2 (431)
      Filter for use with: Whole House Sediment Filter (AO-WH-PREV or AO-WH-PRE). Use only certified, genuine A. O. Smith filters for continued contaminant removal and system performance. Longer lasting appliances - whole house filter system designed to reduce sediment from every tap. 5 micron filtration - reduces sediment smaller than the human eye can see. Replacements made easy - no plumber necessary. Replace filter every 6 months. Standard capacity (2.5") filter is perfect for household sizes of 1-4 people. Includes 2-pack of replacement sediment filters.
  • Aquaboon 5 Micron 20
    Bestseller #1
    Aquaboon 5 Micron 20" x 4.5" CTO Carbon Block & Sediment Replacement Filter Cartridges Set | 2 set, 4PK COMPATIBLE WITH: FC25BX4, 32-450-20-GREEN, EP20-BB, 2C-20BB, 155358-43, DGD-5005-20, 33003117-1 (1046)
      💧 [HEALTHY SET] Our set of Sediment and Carbon filter cartridges will help you to keep your water purified and fresh. Carbon filters work on the basis of the absorption process and sediment filters provides mechanical filtration. Our Filter Cartridges has been thoroughly tested and verified to meet health and product standards. Make your home uncontaminated by removing chlorine and other harmful industrial chemicals - drink the water knowing that it is 100% safe. 💧 [CARBON] Activated carbon water filter comes in sealed packaging, so you can be sure that it will not go to waste, it will works better and lasts longer. This durable coconut shell activated carbon water filters is mainly designed to remove volatile organic compounds, in particular chlorine. It will also help you get rid of chemicals such as pesticides and herbicides. By installing a carbon filter, you can forget about unpleasant taste and smell. 💧 [SEDIMENT] 100% pure POLYPROPYLENE. Quality mechanical filtration ensure to remove more contaminants, large and small particles from drinking water, such as sand, dirt, sludge, and rust particles. It has the advantage of having layers with graded density, it's a sieve with porosity that allows only water to pass through. The inner core of a Sediment filter cartridge is denser than the outer core, which allows the product to trap finer and finer particles, thereby making it serve longer. 💧 [COMPATIBLE CARBON CARTRIDGES] BLUONICS BLCTO20X2, BLCTO20X4, ClearChoice CCS031, Express Water FLTWH2045C, FLTWH2045C02, Geekpure BC20-BB-5, Harmsco HAC-BB-20-W, iSpring FC25BX4, KX Matrikx 32-450-20-GREEN, KX-MATRIKX-CTO2-HD20, Pentek 255678-43, EP20-BB, Purenex 2C-20BB, Ronaqua 2C-20BB, 6C-20BB, RA-2CTO-20BB, Tier1 EP5-20BB, FHR-20-45-CARBON-KIT, COMIN16JU023031, Water Filters Depot (WFD) WF-CB205-BB, Wholesale Market LLC BBCTO-20B4, CTO20B4, MAX WATER USA Inc. 104114-4, etc. 💧 [COMPATIBLE SEDIMENT CARTRIDGES] 3M Aqua-Pure 5618903, AP810-2, BLUONICS PP-20B4, ClearChoice CCS034, Filter Specialist CMMF0520-45W1, H2O LF-PP-005-508, iSpring FP25B, FP25BX2, Liquatec SDF-45-2005, Neo-Pure MBGC-45200-05, Pentek 155358-43, CWD-PENTEK-DGD-5005-20, DGD-5005-20, Pura 33003117-1, Purenex 4S-20B-5M, Ronaqua 10S-20BB5, BBSED-20B4, 2C-20BB5, SpiroPure SP-DD-5005-20BB, Tier1 P5-20BB, Valuetrex VX05-20BB, Viqua CMB-520-HF, Watts FPMB-BB5-20, WholesalemarketLLC PP-20B10, etc.
  • Express Water Whole House Heavy Metal Water Filter Set – 3 Stage Water Filtration Replacement Kit – Sediment, Carbon Block, KDF High Capacity Cartridge Filters – 5 Micron Water Filter 4.5” x 20” inch
    Bestseller #1
    Express Water Whole House Heavy Metal Water Filter Set – 3 Stage Water Filtration Replacement Kit – Sediment, Carbon Block, KDF High Capacity Cartridge Filters – 5 Micron Water Filter 4.5” x 20” inch (386)
      Whole House Water Filter System: Reduce harmful impurities from your entire home’s water with Express Water’s 3 Stage Water Filtration System and easy to replace Water Filter Replacement Cartridges. Long Lasting Water Filtration: The highest quality, long-lasting materials give you up to 100,000 gallons of water filtration depending on incoming water quality. Heavy Metal Water Filter: Protect your home from dangerous impurities with the advanced KDF heavy metal filter which combines catalytic carbon and high purity ionically charged copper and zinc granules to reduce Heavy Metals, Iron, Lead, Nickel, Chromium and more Save Time and Money: High-capacity filters will efficiently and effectively filter your water without loss of pressure. Please be informed - Whole house systems are installed at the main water supply line for the purpose of treating all incoming water in your home or business. Unlike reverse osmosis systems, whole house systems will NOT reduce Total Dissolved Solids (TDS). If you are searching for a filter that reduces TDS, see our Express Water Reverse Osmosis systems. Easy to Replace Water Filter Cartridges: All Express Water whole house water filter replacement cartridges are designed for quick and easy replacement to keep your system up and running. Sediment Filter: Keep the most damaging sediments out of your water with Express Water’s 4-layer smart water filter design. Catch and filter the largest impurities in the filter’s outer layers while inner layers catch the finer impurities giving you the longest lasting and effective water filtration system for your home. Carbon Water Filter: Efficient tight packed carbon granules give you the efficient high capacity filtration you need in your whole home water filtration system. Vacuum heated organic coconut shell carbon provides an added layer of filtration with the freshest taste. Take Care of Your Home: Protect our plants, give healthier water to your pets and extend the life of your dishwasher, laundry machine, and other appliances through proper and efficient 3-stage water filtration. On Demand Support: Support from experts who can answer any of your questions about your replacement water filters. Trust Express Water: Choose the best filters for home filtration and make your house a clean water house today!
  • iSpring FC25B Whole House Water Filter Replacement Cartridge, CTO Carbon Block, 20” x 4.5”
    Bestseller #1
    iSpring FC25B Whole House Water Filter Replacement Cartridge, CTO Carbon Block, 20” x 4.5” (386)
      Protect Your Family and Household Appliance from Chlorine and More: Say goodbye to smelly, bad tasting water! The FC25B carbon block filter is specially designed to remove up to 99% of chlorine from water as well as taste and odor compounds, cloudiness, and chemicals. Standard Size: Our FC25B whole house water filter fits standard housings that requires 20” x 4.5” water filter cartridges, including brand name models. The 20” x 4. 5” water filter cartridge has a minimum impact on water flow (up to 15 GPM) and require minimum maintenance Top-Notch Quality: Our FC25B CTO Carbon Block filters are made of high-quality coconut shell activated carbon for maximum filtration efficiency and filter life. Activated carbon is an effective adsorbent because it is a highly porous material and provides a large surface area to which contaminants may adsorb. This whole house water filter is tested by an independent third-party to meet NSF/ANSI standards. Peace of Mind Customer Service: Register online to activate your manufacturer and life-time free tech support from U. S. local support team. We stand behind our products and if you encounter any problems with any of our water filters please reach out to us immediately. We are happy to help! Please Note: The water filter cartridges are individually wrapped to ensure freshness. Please unwrap the cartridges before use. Unlike an RO membrane, the filters don’t reduce Total Dissolved Solids (TDS), and instead keeps healthy minerals in your water. If you are interested in a filter that removes TDS, consider our iSpring Reverse Osmosis (RO) systems.
  • 10 Pack Activated Carbon Block ACB Water Filter Replacement – 5 Micron, 10 inch Filter – Under Sink and Reverse Osmosis System
    Bestseller #1
    10 Pack Activated Carbon Block ACB Water Filter Replacement – 5 Micron, 10 inch Filter – Under Sink and Reverse Osmosis System (386)
      Reverse Osmosis Filter Replacement: Experience what water should taste like with the Express Water reverse osmosis water filtration system removing up to 99.99% impurities. RO Water Filter Replacement: Each Express Water replacement filter is specially designed to work together and compliment each other. Get the cleanest water and the best value in your reverse osmosis water filter. Activated Carbon Water Filter: Made with 100% laboratory vacuum heated, cleaned coconut husk carbon, Express Water carbon block filters reduce chlorine, VOC, bad tastes, odors, cloudiness, and industrial solvents. Replacement Water Filter: Express Water filters are made with the highest quality materials for long-lasting filtration and value. On Demand Support: Support from experts who can answer any of your questions about your replacement water filters
  • Aquaboon 5 Micron BB 20
    Bestseller #1
    Aquaboon 5 Micron BB 20" x 4.5" CTO Carbon Block & Sediment Replacement Filter Cartridges Set | 1 set, 2 packs FC25BX4, 32-450-20-GREEN, EP20-BB, 2C-20BB, 155358-43, DGD-5005-20, 33003117-1 (1046)
      💧 [HEALTHY SET] Our set of Sediment and Carbon filter cartridges will help you to keep your water purified and fresh. Carbon filters work on the basis of the absorption process and sediment filters provides mechanical filtration. Our Filter Cartridges has been thoroughly tested and verified to meet health and product standards. Make your home uncontaminated by removing chlorine and other harmful industrial chemicals - drink the water knowing that it is 100% safe. 💧 [CARBON] Activated carbon water filter comes in sealed packaging, so you can be sure that it will not go to waste, it will works better and lasts longer. This durable coconut shell activated carbon water filters is mainly designed to remove volatile organic compounds, in particular chlorine. It will also help you get rid of chemicals such as pesticides and herbicides. By installing a carbon filter, you can forget about unpleasant taste and smell. 💧 [SEDIMENT] 100% pure POLYPROPYLENE. Quality mechanical filtration ensure to remove more contaminants, large and small particles from drinking water, such as sand, dirt, sludge, and rust particles. It has the advantage of having layers with graded density, it's a sieve with porosity that allows only water to pass through. The inner core of a Sediment filter cartridge is denser than the outer core, which allows the product to trap finer and finer particles, thereby making it serve longer. 💧 [COMPATIBLE CARBON CARTRIDGES] BLUONICS BLCTO20X2, BLCTO20X4, ClearChoice CCS031, Express Water FLTWH2045C, FLTWH2045C02, Geekpure BC20-BB-5, Harmsco HAC-BB-20-W, iSpring FC25BX4, KX Matrikx 32-450-20-GREEN, KX-MATRIKX-CTO2-HD20, 255678-43, EP20-BB, Purenex 2C-20BB, Ronaqua 2C-20BB, 6C-20BB, RA-2CTO-20BB, Tier1 EP5-20BB, FHR-20-45-CARBON-KIT, COMIN16JU023031, Water Filters Depot (WFD) WF-CB205-BB, Wholesale Market LLC BBCTO-20B4, CTO20B4, MAX WATER USA Inc. 104114-4, etc. 💧 [COMPATIBLE SEDIMENT CARTRIDGES] 3M Aqua-Pure 5618903, AP810-2, BLUONICS PP-20B4, ClearChoice CCS034, Filter Specialist CMMF0520-45W1, H2O LF-PP-005-508, iSpring FP25B, FP25BX2, Liquatec SDF-45-2005, Neo-Pure MBGC-45200-05, 155358-43, CWD--DGD-5005-20, DGD-5005-20, Pura 33003117-1, Purenex 4S-20B-5M, Ronaqua 10S-20BB5, BBSED-20B4, 2C-20BB5, SpiroPure SP-DD-5005-20BB, Tier1 P5-20BB, Valuetrex VX05-20BB, Viqua CMB-520-HF, Watts FPMB-BB5-20, WholesalemarketLLC PP-20B10, etc.
  • Pentair Pentek CBC-10 Carbon Water Filter, 10-Inch, Under Sink Carbon Block Replacement Cartridge with Bonded Powdered Activated Carbon (PAC) Filter, 10
    Bestseller #1
    Pentair Pentek CBC-10 Carbon Water Filter, 10-Inch, Under Sink Carbon Block Replacement Cartridge with Bonded Powdered Activated Carbon (PAC) Filter, 10" x 2.5", 0.5 Micron (386)
      HIGH-CAPACITY SMALL PARTICULATE REDUCTION of bad taste & odor, chlorine and certain VOCs to provide great tasting drinking water FITS ALL 10" standard housings and can replace any 10" x 2.5" carbon filter cartridge EFFECTIVE AT FILTERING fine sediment chlorine taste and odor NSF INTERNATIONAL tested and certified for your peace of mind 20,000 GALLON CAPACITY. Replace every 3 months or when you notice a drop in water pressure or water quality
  • GOLDENROD (596-5) Fuel Tank Filter Replacement Water-Block Canister
    Bestseller #1
    GOLDENROD (596-5) Fuel Tank Filter Replacement Water-Block Canister (386)
      For GOLDENROD canister fuel tank filter Water-Block models 596 and 596-3/4 only 10 micron filtration Water-Block filter removes water from gasoline and diesel fuel Water-absorbing polymers trap water, restricting fuel flow when it is time to replace the canister Made in the U.S.A. Fit Type: Universal Fit
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