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ispring box 25 cto carbon block water filter replacement cartridge compare kx matrikx pentek omniwater filter replacement cartridge hydronix
iSpring FC15X25 Box of 25 CTO Carbon Block Water Filter Replacement Cartridge (FC15X25)
  • Individually wrapped, packed in 25 pcs per carton
  • 5 micron Rating
  • Made from coconut shell carbon
  • Fits 10" standard filter housings
  • Removes Chlorine and Organic chemicals
  • $190.99
    iSpring F6CTO 10
    iSpring F6CTO Prefilters for CW31 and Standard Reverse Osmosis RO Water Filter Systems 1-Year Replacement Supply Filter Cartridge Pack Set, No Membrane (F6CTO)
  • 1-year supply of replacement filters for 3-Stage water system CW31 and other 10 inch standard water systems
  • Individually wrapped
  • Standard sized 10" x 2.5"
  • Fits filtration systems that use standard sized filter housings
  • Includes 2 pieces of 5 micron sediment filters #FP15 and 4 pieces of 5 Micron CTO Carbon Filters #FC15
  • $48.99
    iSpring AFW3+ABV3 Water Supply Connector (1/2 inch NPT, Tube 3/8 inch) (AFW3+ABV3)
  • Compatible with most Reverse Osmosis systems (including brand names) in the market
  • Connects to 3/8" tubings
  • 1/2" NPT
  • $27.99
    iSpring AFR300 Flow Restrictor / Flow Limit 300 ml/min
    iSpring AFR300 Flow Restrictor / Flow Limit 300 ml/min (AFR300)
  • Compatible with most Reverse Osmosis systems (including brand names) in the market
  • To be installed on the DRAIN line
  • 1/4" quick connect fitting
  • $13.99
    leak alarm
    iSpring WD01 Leak Alert Electronic Water Detector/Water Sensor white, Flood Alarm (WD01)
  • Use to detect leaks before costly water damage is caused.
  • 9V battery lasts one year (included).
  • Fully automatic operation-no wiring required.
  • Loud 110 dB alarm (Pleasant bird twittering sound).
  • Double-side sticker and magnet sticker included for easy placement.
  • $12.99
    flow restrictor
    iSpring AFR1500 Flow Restrictor (AFR1500)
  • Compatible with most reverse osmosis systems of more than 200GPD (including brand names) in the market
  • To be installed on the drain line
  • Compatible with iSpring 200GPD, 300GPD, and 400GPD systems
  • Features 1/4” fitting
  • $18.99
    iSpring AFW2ABV3 Water Supply Connector (1/2 inch NPT, Tube 1/4 inch) (AFW2ABV3)
  • Stainless Steel Feed Water Adapter for Reverse Osmosis Systems, 1/2" NPT
  • Compatible with most Reverse Osmosis systems (including brand names) in the market
  • Connects to 1/4" tubings
  • $24.99
    iSpring FC15B 5-Micron Coconut Shell Activated CTO Carbon Block Water Filter Replacement Cartridge for Under Sink and Whole House Water Systems
    iSpring FC15B 5-Micron Coconut Shell Activated CTO Carbon Block Water Filter Replacement Cartridge for Under Sink and Whole House Water Systems (FC15B)

    Using quality coconut shell carbon and highly compact fabrication tech, this activated carbon block CTO(Chlorine, Taste, and Odor) filter cartridge is designed and produced to achieve filtration efficiency and long filter life for 10" Whole House and Undersink Water Filtration Systems. Free of surfactants, binders, and adhesives. No leaching carbon ash.

    Knocks out cloudiness as well as bad tastes and odors, removes up to 99% of chlorine, and is effective on herbicides and industrial solvents and other contaminants like trihalomethanes. Steady flow and high absorption.

    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 ideal performance, depending on the quality of source water and daily water consumption.

    Fits standard 10"x4.5" whole house and undersink water filtration systems. Official 2nd stage Carbon Block replacement filter cartridge for iSpring Under Sink Water Filtration System US21B as well as Whole House Water Filtration System WGB21B; 1st stage replacement filter cartridge for WGB21BM and WGB21B-PB. Individually sealed for freshness.

    Your worry-free shopping experience is backed by a 30-day money-back guarantee, extended warranty upon registration, and lifetime tech support from iSpring in Atlanta, GA at (678) 261-7611.


    $50.99
    2.5\
    iSpring FC15 NSF/ANSI 58 Certified Standard 10 inch CTO Carbon Block Water Filter Cartridge Replacement, 5 Microns (FC15)
  • Reduces fine sediment and chlorine taste and odor in residential and commercial drinking water
  • Rated at 5 microns
  • Bonded Pac media with polyolefin pre-filter and polyethylene netting
  • Initial pressure drop of 3.4 psi at a flow rate of 1 gpm
  • Water temperature range of 41 to 100°F (5°C to 38°C)
  • NSF/ANSI 58 Certified: Independently tested and certified to meet NSF/ANSI 58 standards, ensuring reliable removal of harmful contaminants for safe, high-quality drinking water.
  • $21.99
    iSpring ALS1 Leak Detector and Shut-Off Valve for Reverse Osmosis and Under Sink Water Filtration Systems - 1/4” Quick Connect (ALS1)
  • The shut-off valve protects your home and business properties from costly water damage by automatically shut off the incoming water supply once the pad detects a potential water leakage
  • Just take out the screw and twist the unit to open for pad replacement. The pad needs to be replaced every time it touches the water and expands
  • 1/4” quick connect: Fits ¼” tubings
  • Peace of mind customer service: Register online to activate your manufacturer warranty and life-time free tech support. We stand behind our products and if you encounter any problems with any of our products please reach out to us immediately. We are happy to help!
  • Work with iSpring ALS1P3 replacement pads
  • $29.99
    carbon block filter
    iSpring FC25 High Capacity 20” x 2.5” Water Filter Replacement Cartridges - CTO Carbon Block - Fits WCB32C, WCB32O, and RCB3P (FC25)
  • Protect Your Family and Household Appliance from Chlorine and More: Say goodbye to smelly, bad tasting water! The FC25 carbon block filter is specially designed to remove up to 99% of chlorine from water as well as various other contaminants that cause unpleasant odors and tastes.
  • Standard Size: Our filter set fits standard 20” x 2.5” housings, including brand name models.
  • Our FC25 CTO Carbon Block filters are made of coconut shell carbon to increase filtration efficiency and extend filter life. They are tested by an independent third-party to meet NSF/ANSI standards. The filters have a capacity of 30,000 gallons of water, enough to supply a family of four with clean water for half a year. Water flow: up to 12 GPM.
  • Peace of Mind Customer Service: Register online to activate your extended manufacturer warranty 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 products please reach out to us immediately. We are happy to help!
  • Please Note: The 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). If you are interested in a filter that removes TDS, consider our iSpring Reverse Osmosis (RO) systems.
  • $41.99
    iSpring WGB21B 2-Stage Whole House Water Filtration System, with 10" x 4.5" Sediment CTO(Chlorine, Taste, and Odor) Filter, 1" Inlet/Outlet (WGB21B)
  • Powerful 2-Stage Filtration – The iSpring WGB21B whole house water filtration system includes a 10" x 4.5" sediment filter and a CTO carbon block filter — removing up to 99% of chlorine, along with sediments, rust, tastes, odors, herbicides, and more for clean, odor-free water.
  • Compact Yet Powerful: Ideal for apartments, smaller homes, or vacation properties, this 10” x 4.5” whole house water filter fits tight spaces while delivering long-lasting, high-performance filtration.
  • Built to Last – Designed for durability, this water filter system delivers reliable performance for up to 50,000 gallons or 12 months, depending on water usage and quality. It is a long-lasting solution for those seeking a dependable whole house water filtration system.
  • Quick and Easy Installation – Designed with a 1” NPT inlet/outlet and 10” x 4.5” filters, this water filter system for home delivers a strong water flow (up to 15 GPM) while requiring minimal maintenance.
  • Easy Filter Changes — Built-in pressure release buttons let you swap filters fast and mess-free.
  • Peace of Mind Guaranteed – Supported by a 1-year limited warranty and lifetime technical support from our U.S.-based customer service team. Whether you're purchasing your first whole house water filtration system or replacing your current home water filter, we're here to help—before and after your purchase.
  • Sealed for Quality — Every cartridge is individually wrapped to ensure freshness and peak performance. Be sure to unwrap before use.
  • Healthy Minerals Retained – This filter retains healthy minerals and does not reduce TDS. For total dissolved solids removal, explore our iSpring Reverse Osmosis systems—perfect complements to any water filtration system for house or whole home water filtration system.
  • $173.99
    iSpring AFR420K Flow Restrictor, White (AFR420K)
  • Compatible with most reverse osmosis systems of 75 - 100 GPD (including brand names) in the market
  • To be installed on the drain line
  • Recommended for RO systems of 75GPD or 100GPD, or for customers whose source water TDS is more than 200 ppm
  • Features 1/4” quick fitting
  • $14.99
    LittleWell 0404UMJX2 (M22X2) 1/4" MNPT x 1/4" MNPT Straight Connector, Pack of 2 (0404UMJX2 (M22X2))
  • Suitable for use with Pex, CPVC, and Copper pipe.
  • Lead Free and Non Toxic.
  • 1/4" x 1/4" M NPT.
  • $8.99
    FC15BX4 4.5x10 in. 5 micron Carbon Block (CTO)
    iSpring FC15BX4 4.5x10 in. 5 micron Carbon Block (CTO) Water Filter Replacement Cartridge for Under Sink and Whole House Water Filtration Systems, Pack of 4 (FC15BX4)

    Using quality coconut shell carbon and highly compact fabrication tech, this activated carbon block CTO(Chlorine, Taste, and Odor) filter cartridge is designed and produced to achieve filtration efficiency and long filter life for 10" Whole House and Undersink Water Filtration Systems. Free of surfactants, binders, and adhesives. No leaching carbon ash.

    Knocks out cloudiness as well as bad tastes and odors, removes up to 99% of chlorine, and is effective on herbicides and industrial solvents and other contaminants like trihalomethanes. Steady flow and high absorption.

    Each cartridge 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 ideal performance, depending on the quality of source water and daily water consumption.

    Fits standard 10"x4.5" filters. Official 2nd stage Carbon Block replacement filter cartridge for iSpring under sink water filter US21B and whole house water filtration system WGB21B; 1st stage for WGB21BM and WGB21B-PB. All 4 cartridges are individually sealed for freshness.

    Your iSpring shopping experience is backed by a 30-day money-back guarantee, extended warranty upon registration, and lifetime tech support from iSpring in Atlanta, GA at (678) 261-7611.


    $133.99
    reverse osmosis filter replacement
    iSpring F3CTO 10-inch Standard Replacement Filter Set Cartridges for RO and 3-Stage Water Filtration Systems Sediment, 2 x Carbon Block Filters (F3CTO)
  • Fits 10" standard filter housings. Fits iSpring CW31System. Compatible to most RO systems, includes Watts Premier, Flowmatic, PuROLine, Crystal Quest, Apec, and etc.
  • Individually wrapped
  • Pack of 3 replacement water filters. 1x PP sediment filter, 2x Carbon block filter
  • 6-month supply of replacement filters for water filter systems
  • $34.99
    iSpring CW21 2-Stage Whole House Water Filtration System for RV, Sediment Filter + CTO Carbon Block Filter, Tankless, High Capacity, BPA Free (CW21)
  • Premium Quality Filtered Water - Invest in our top-of-the-line system, which produces highly filtered water, to save money on bottled water. Enjoy the fresh taste of water from your own tap.
  • 2-Stage filtration Process – The iSpring CW21 system has two stages of filtration. The first stage is a sediment filter, which eliminates particles bigger than 5 microns as well as dirt, sand, silt, and rust from water. The CTO carbon block filter is the second stage, which eliminates undesirable tastes, odors, and chlorine. And also offers water that has a highly refreshing sight and flavor.
  • DIY Installation - No need for any plumbers or difficult installation tools. Simple and easy DIY hassle-free installation. Just follow the instructions in the user manual and the system is ready to use. It is also very easy to maintain the system.
  • High Capacity & Long Lasting – iSpring products are engineered for long-lasting durability. The robust construction of filter housings increases the life of the system and prevents any kind of leaks. Depending on the usage, the average replacement cycle for filters is 3-12 months for sediment filters and 6-12 months for second-stage carbon block CTO filters.
  • Fantastic Customer Support & Manufacturer Warranty – Congratulations! Your iSpring CW21 system is backed by a 1 year Manufacturer Warranty. Furthermore, we have a dedicated and experienced team of customer service agents who are ready to resolve your issues if needed.
  • $272.99
    iSpring FCDS 3rd Stage Carbon Block CTO Replacement Filter for DS4B & DS4S (FCDS)
  • MOST IMPURITIES REDUCTION - By eliminating chlorine and other hazardous industrial pollutants from your house, our 3rd stage Carbon block filters provide you water without fear of contamination. With the excellent iSpring Built-in 4-Stage Filtration System Dispenser, you can be assured that your water is filtered.
  • DURABLE AND LONG LASTING - Each cartridge is individually wrapped to ensure that the filter stays fresh. Please flush the filter after installation to get a crisp taste of water. Allow it to provide your loved ones with a fantastic cleaner water experience.
  • EASY INSTALLATION AND ELEGANT DESIGN - Carbon replacement filters are specifically designed for easy DIY installation. A simple twist and lock will take only a few minutes. No need to call plumbers or experts! Save your time
  • EFFICIENT FILTRATION - Carbon Block CTO Replacement Filter is made up of high-quality material to meet the demand of your contaminated water. Filter changing schedule will be based on the contamination level of your source water and your water usage. We recommend changing your filters every 6-12 months for ideal filtration performance.
  • OUR CUSTOMERS, OUR ASSET - iSpring really values its customers, and in order to avoid any inconvenience, we have a dedicated customer service team for our customers. Stop worrying and enjoy a lifetime experience of support and help from our experts.
  • $34.99
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