We are looking to install this in a seasonal cabin, can this be winterized?

Hi Cate, This unit should be protected from direct sunlight or freezing temperature. Depending on the environment in the winter, the housings might become damaged. Please contact us with more details so we can better assist you. iSpring Water Systems 678-261-7611 support@ispringfilter.com

I received this whole house filter and one of the cartridges is broken model fc25b. can i get a replacement of this broken cartridge?

allfilters.com I used iSpring for a while and then the types of filters ordered was so confusing......and its all made in China.......unlike advertised. So I switched to allfilters....now keep in mind that they don’t send one at a time....but the price difference, the nonconfusion, sent by USPS and customer support won me over. ALL MADE IN THE USA! Allfilters also sells the canisters. When ordering filters go by the size ei: 4 1/2” x 20”

Do you still need a water softener with this if hardness is 250 ppm?

Hi there, It's optional but would help p[rolong the life of the filters if you install one. We usually recommend a water softener with TDS higher than 700 PPM. Please let us know if you have other concerns. Stay safe! iSpring Water Systems, LLC

What pressure gauge is recommended to install pre and post filter that will work with 3/4" PEX supply line?

I use the one on a spin down pre filter and a 3/4” shark bite with gauge post filter

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💧 Elevate your home’s water game—because clean water is the new luxury.

FITS LIKE A GLOVE - Standard 20" x 4.5" size ensures seamless compatibility with most whole house filter housings—easy upgrade, zero hassle.
ECO FRIENDLY POWERHOUSE - Crafted from premium coconut shell activated carbon, delivering superior filtration with a sustainable edge.
FLOW WITHOUT COMPROMISE - Maintains strong water flow up to 15 GPM, so your daily routine never slows down.
SUPPORT THAT HAS YOUR BACK - Lifetime free tech support from a dedicated U.S. team—because your peace of mind matters.
PURE WATER PURE CONFIDENCE - Removes up to 99% of chlorine, odors, and harmful chemicals for fresh, clean water throughout your home.

The iSpring FC25B is a high-performance whole house water filter cartridge featuring a 20" x 4.5" CTO carbon block made from coconut shell activated carbon. It effectively removes up to 99% of chlorine, taste, odor, and other contaminants while maintaining optimal water flow up to 15 GPM. Compatible with standard housings, it preserves healthy minerals and is NSF/ANSI tested for quality assurance. Backed by lifetime U.S.-based tech support, it’s designed for easy installation and long-lasting performance.

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Manufacturer	iSpring Water Systems
Part Number	FC25B
Item Weight	5.19 pounds
Product Dimensions	4.5 x 4.5 x 20 inches
Country of Origin	China
Item model number	FC25B
Is Discontinued By Manufacturer	No
Size	1 Count (Pack of 1)
Color	Gray
Style	Carbon Filter
Material	Carbon Block
Pattern	Water Filter
Item Package Quantity	1
Number Of Pieces	1
Included Components	1 FC25B CTO Carbon Block Water Filter
Batteries Included?	No
Batteries Required?	No

iSpring FC25B Whole House Water Filter, CTO Carbon Block, 20” x 4.5” for Sediment & Chlorine Removal

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