iSpring F9K NSF Certified 1-Year Reverse Osmosis Water Filter Replacement Pack, 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!

I bought a reverse osmosis system about six months ago. Their system also had a mineralization cartridge, but the water still had a harsh taste. Come to find out it only added calcium back in. I came across this mineralization cartridge and it actually added in all the other stuff, including the calcium. The water now taste so much smoother it’s unbelievable! So if your RO systems water taste a little bit harsh buy this filter and install it. Thr flow arrow is a little hard to see but it’s on the cartridge itself. I only recommend this filter because it works. The water, the coffee everything taste better. Have a great day.

The media could not be loaded. I have had unit RRC1UP-AK7 from 123Filter.com for over 7 years now. I have never written a review, but after I bought another filter set I had to write a review. This unit has been a game changer for my household and health.To start off, the unit is super easy to install, I mounted it under my kitchen sink. Works just as described in every way. The unit strips my water of everything bad, while adding the perfect blend of minerals back and alkalizes my water before passing though a UV light, giving my family the safest healthiest water.The filter changes are simple once you understand the replacement process. It may be a bit overwhelming at first, but gets very easy for even someone that may not be the best handyperson. My best advise though is watch videos about filter changes and make sure where ever you install it you think about when its time to change the filters. I left my unit with excess hose, so I can pull the unit out from under the sink. ( I hang the unit on my cabinet door to make the changes)Over the time I have had my RO system I have had two issues, one with the UV set, and one with the alkaline filters, but both times the customer service at 123 Filters are prompt, courteous and knowledgeable. They respond quickly and have the feel of a small town business, but they are no small business. I know I may be going overboard giving 123 Filters props, but "in todays world" if a business is doing what any customer would actually expect of a business, I want to give them their dues.I have 123 Filters RO system (listed above), their 15 stage shower filter, and the 3 stage whole house water filtration systems (WGB32B), and we are happy with it all.Again, props to iSpring, props to 123 Filters for selling great products and backing it up with amazing customer service.

If you're serious about coffee, you know that water quality is everything. This iSpring alkaline filter doesn’t just clean the water—it enhances it. By restoring essential minerals and balancing pH, it gives my coffee that perfect, clean taste every single time. Installation was a breeze thanks to the quick-connect system, and maintenance is simple. I can confidently say that since adding this to my RO system, my espresso shots taste smoother, and my customers have noticed the difference! Plus, iSpring’s customer service is next-level—Nicholas personally made sure my system was running perfectly. If you own a coffee shop, this is an absolute must for consistency and quality.

Two of these (instead of one) should be included in the "1 year" filter replacement kits which contain 2 of all the other filters (except the RO unit). This has been quite bit of annoyance since I change all 5 filters (stage 1, 2, 3, 5, 6) on minimally used once a year and the RO unit (stage 4 I believe) every two years. So this causes me to buy one of these every two years (along with the RO filter).The unit arrived well packed was all sealed up and included a parts kit.I have to knock off a star for the annoyance of iSpring not including 2 of these instead of 1 in their water filter replacement kits.

First off the customer service from this company is great! Had a leaky elbow on our RO system and they were quick to send a replacement in the mail. The filter replacements are good quality and were easy to replace with the YouTube videos the company produces. Took about 20 min to swap out all our dirty filters and our water taste great. Worth the money!

So i was suffering from gerd or heartburn or whatever and was touted the benefits of high alkaline water. I started with the bottles which were expensive and too much work to lug home. I then got the drops which worked great, but its a lot of work to keep counting the 22 drops in my 2 liter waters and it was really expensive. But then i finally found this inexpensive option, which lasts 6 months or more. It works great and raises my waters alkaline to the 8.5-9.5 levels i want. I use it with everything, including my coffee.One thing I should mention is that you have to run your tap for 30 seconds or so or you will be drinking alkaline water of 10 plus! I also bought a digital tester, so I can confirm that running the water for 15-30 seconds will bring the alkaline level to your desired level. Good luck everyone. Highly recommend.

These filters are a great way to get clean drinking water at home. When my amazon order was missing some filters, I reached out to Ispring and Sean did a great job helping me out. He was prompt, understanding and sent me the missing filters. Thank you Sean!