iSpringF9K NSF Certified 1-Year Reverse Osmosis Water Filter, Alkaline Remineralization Filters for 6-Stage RO Systems, Without RO Membrane

I purchased the iSpring F9K 1-Year Reverse Osmosis Water Filter Replacement Cartridge Pack for my 6-stage RO system, and I’m very impressed with the performance. The pack includes the essential filters, including the alkaline remineralization filters, which have made a noticeable difference in the taste of our water.The filters are easy to install and last a full year, as advertised. The added alkaline filtration restores essential minerals, improving both the taste and quality of the water. It’s a great investment for anyone with an iSpring RO system who wants to maintain clean, great-tasting water throughout the year. Highly recommended!

Great quality, great packing, clear instructions, no leaks, and leaves my crap city water taste like drinking from a stream from the Himalayas

Works very well. Cleaned up my very bad well water. Easy to install.

I purchased this system in February 2018, I wanted to wait a while to see how it performed before writing a review. I have a background in water quality and am a bit of a water snob so I had very high expectations for quality and the water it produced.Installation was great, they include everything you need to install it on existing equipment. It attached to the cold water angle stop for your sink, they have a nice brass t fitting that will adapt to whatever you have under your sink either 3/8 or 1/2. it included an isolation valve so you can easily turn off your filter system for maintenance and carriage replacement. As a plumber I was very pleased with install. I am very picky in the way I put things together and it still only took me about an hour or so. I bet you could do the job in 30 minutes if you were in a hurry.Parameters: my tap water has any where from 250-400 ppm total dissolved solids (TDS). That's pretty standard for municipal water in southern California. still that is allot of stuff dissolved in the water including lead, arsenic, chloramine, and trace chemicals. Ph from tap is about 7.8. Coming out of the RO membrane before it hits the Alkaline cartridge I got a TDS of about 9-14 ppm. That is pretty incredible. the finished Alkalinity from this system was 8.8! perfect alkaline water. the mineral content was a great also, about 40-60mg/L of Carbonate hardness and 60mg/L general hardness. That means the perfectly minneraled and alkalized water free from chemicals, heavy metals or any harmful contaminates.The flavor as you can imagine is incredible. I use it to brew beer with, my friends cant believe the quality of my brew, the secret is the water. I use it to brew kombucha with similar results. I use it to fill my fish tanks, the African Cichlids need the high Ph.Finally the customer service for iSpring is impeccable. I bought a cartridge replacement and has some issues, customer service was quick to handle my issue and did not cost me a dime to make it right.these are the genuine replacment filters and they make the system work as it did the day I installed it

I am giving this 4 stars because the system worked well overall except for the alkaline filter; however, the customer service was impressive. I bought the 7-stage filter a year and a half ago, and it worked great. The water was clean and tasted good. I recently bought this filter replacement, and after installation, I found that while the water was good after the post-carbon filter, the alkaline filter was giving it a weird plastic/metallic/brass taste. However, I was able to talk to consumer service, and they quickly showed me how to resolve this issue and replace my faulty filter. I was surprised with how fast the consumer service responded to fix the issue.

These are replacement cartridges for our water system. Great quality, easy to install & last as they should. Definitely recommend.

We’ve been using iSpring products for a while now and are impressed with their performance. Recently, we needed a replacement for a couple of filter components, and ordered one set from amazon.com, but ordered the wrong set it turns out. We reached out to iSpring customer service, and I must say—the support was outstanding. In particular, Julius went above and beyond—he was prompt, helpful, and made sure we got what we needed quickly. It’s reassuring to know that if an issue arises, you’ll get the support you need. Thank you, Julius and the iSpring team!

I bought this iSpring filter set a year ago, and they definitely lasted the full year, but no longer. The quality is good, and the water tastes great, especially with the alkaline remineralization.Just keep in mind it really is a true 1-year supply, so be ready to replace right on time. Overall, I’m happy and will be reordering.