★★★★★
Wonderful product.
Robert—December 31, 2024✓ Verified purchase
Hard to believe how much "stuff" these filters remove - and we are on a municipal water system. Read more
iSpring FC15B High Capacity Activated CTO Carbon Block Filter for Under Sink and Whole House Water Filtration System
$34.69
About this item
- [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 Alpharetta, GA
$34.69
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Product details
| Brand | iSpring |
|---|---|
| Special Feature | UV Light Disinfection |
| Material | Carbon Block |
| Capacity | 50000 Gallons |
| Included Components | 1 FC15B CTO Filter |
| Installation Type | Under Sink |
| Purification Method | Activated Carbon, Carbon Block |
| Power Source | Electric Power |
| Item Weight | 2.7 Pounds |
| Model Name | FC15B High Capacity Activated CTO Carbon Block Water Filter |
Technical specifications
| brand | iSpring |
|---|---|
| special_feature | UV Light Disinfection |
| installation_type | Under Sink |
| power_source | Electric Power |
| item_weight | 2.7 pounds |
| model_name | FC15B High Capacity Activated CTO Carbon Block Water Filter |
| upc | 662425080212 |
| global_trade_identification_number | 00662425080212 |
| manufacturer | iSpring Water Systems |
| part_number | FC15B |
| product_dimensions | 4.5 x 4.5 x 10 inches |
| item_model_number | 1 |
| is_discontinued_by_manufacturer | No |
| size | CTO Filter |
| color | 5-Micron 10"x4.5" |
| style | Chlorine Removal Water Filter |
| pattern | Water Filter |
| item_package_quantity | 1 |
| number_of_pieces | 1 |
| special_features | UV Light Disinfection |
| batteries_included | No |
| batteries_required | No |
| warranty_description | Your risk-free shopping experience is backed by a 30-day money-back guarantee and lifetime tech support from iSpring in Atlanta, GA. |
| best_sellers_rank | #2,832 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Whole House Water Treatment Systems |
| date_first_available | October 6, 2016 |
From the brand
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Customer reviews
4.71,141 ratings
Customers say
Customers find the water purification unit works well in filtration systems, with one mentioning it effectively removes chlorine.
★★★★★
Reliable, Perfect Fit, and Worth the Price
Jeremy T.—January 1, 2026✓ Verified purchase
Yes, it costs a bit more than the knock-offs—but after trying those, I’m done experimenting. The iSpring FC15B fits every time, no forcing, no leaks, no “is this seated correctly?” stress. That alone makes it worth the extra cost. Water quality is consistently great, and the carbon block does exactly what it’s supposed to do—noticeably better taste and odor reduction right away. It works flawlessly in my under-sink system and gives the peace of mind you want when it’s part of your whole-house setup. I’ve learned the hard way that saving a few dollars on off-brand filters usually leads to frustration or replacements. This one just works, installs cleanly, and performs as advertised. Sometimes paying a little more is actually the cheaper option. Highly recommend. Read more
★★★★☆
Works well.
KarenH—June 5, 2025✓ Verified purchase
We have a high concentration of iron and manganese in our well so we change it every 6-8 weeks Read more
★★★★★
Easy customer service
Matt Estrada—January 5, 2026✓ Verified purchase
Had it explode do to possible pressure build up or something off the 5hp well pump. Contacted support and they asked questions, I supplied the pictures and explained and they completely replaced. Was much appreciated! Awesome and thank you again. Read more
★★★★★
Clear water
Adrian—December 29, 2025✓ Verified purchase
For us, this has been a very useful purchase. Water is clear after passing though this filter. Read more
★★★★★
Great customer service
Amanda—October 19, 2025✓ Verified purchase
Had a problem with the wrong item being shipped but Nick from Ispring was very helpful and got the correct product on the way. Read more
★★★★★
Great Customer Service and a great product.
Considerable—January 8, 2019✓ Verified purchase
The Big Blue system works SO MUCH better than one we had before. The whole system is well built and easy to install. Best of all, the filters are great. We were missing a gasket on one of that came with the system. It just needed a gasket. I contacted customer service and was IMMEDIATELY sent a new CTO Carbon Block filter with both gaskets. Now, I will use the one that was missing a gasket and simply reuse one of the gaskets when I use the second one. That's what I call service with a smile! Read more
★★★★★
Will recommend
rochelle hughes—June 22, 2025✓ Verified purchase
Great product Read more
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