iSpring FA15 Alkaline Inline Water Filter Cartridge, 10” x 2” with 1/4” Quick Connect, NSF Certified, Add-on for RO Systems, Balances pH & Restores Minerals, 3-Layer Replacement Filter

Super system at this price! We've bought it years ago. Of course, the filters fit. We installed the iSpring reverse osmosis set a few years back. It is well worth it's money by now. Water from regular interval filters tastes good to me, and I am sensitive when it comes to water's taste. Can't drink odd or off tastes without cringe. I like arrowhead though not in ecstasy about it, not ok from plastic bottles stored in hot weather except in emergencies. I like some mountain streams and some wood springs, am ok with occasional, light carbonation - though it won't improve the taste, just change and mask it. We also used different $15-30 test strips on occasion throughout the house and this water's our clean baseline. I hate chlorine taste and feel and do not want more iron or lead or PFAS than necessary, either. There's only so much antioxidants can do for us. So, despite the terrible fact that this system wastes 2x the amount of water you get from it (wish we could rig it so the excess watered our garden or plant) - this is totally worth it to me. I try to meditate when filling a bottle to put in the fridge for the day, it takes about 20 seconds. It's not so bad with just a glass, but it also isn't for the super easily annoyed. Our storage canister, which is slowly refilled with pre-filtered water after you tab out some, is great for two or three people to drink and cook. If you need a lot of water at a time, you might require a larger system. Think of the time saved hauling and trashing bottles, that gives ample patience and glee to the adults at least. Installation is a bit tedious but straightforward enough. And here's a secret superpower: iSpring's customer service is actually super friendly and helpful! After some years the system started dripping (to refill the reservoir) and just didn't stop unless we turned off water. Called CS and they helped us troubleshoot successfully. Yey! If you have no savy at all, get someone to install this for you and set a reminder to replace filter cartridges on schedule. Especially renters profit from the compact and relatively easy system, it takes some space but leaves enough of room under our double sink for two small trash bins and detergents. The shower's got a cheaper filter (which won't waste) and I would NOT drink that water. It's just barely ok on the skin. This water quality's actually impressive given the price of this system is in the low hundreds. Even disregarding eventual medical bills you prevent, you'll save that back financially by just stopping to shop bottled water. We get solid bottles and just refill, wash, refill for up to a year of reusable, high quality plastics or years on end with stainless. Health, economy, even ecology benefit (considering this set lasts us years now and we used to buy plastic bottles, made with a lot of damage to water) - We're very happy.

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

Very good reverse osmosis water filtration system, and really easy to install. I installed it by myself.

couldn’t be happier with this system and the support behind it. The filters are working great and have made a noticeable difference right away. What really stood out was the amazing customer support from Sean. He went above and beyond to help me, patiently explaining everything and giving clear, practical advice on adjusting the tank pressure. His instructions were easy to follow, and he even pointed me to a helpful video to make sure I got it right. Sean was responsive, knowledgeable, and genuinely cared about making sure everything worked perfectly. This level of service is rare these days and makes a huge difference. Highly recommend both the system and the company—thanks again, Sean!

I’ve been using this 1 year reverse osmosis filter set for a while and it does an excellent job and keeps the water nice in my 6-stage RO system. The NSF cert is reassuring for knowing the filter quality I can expect, and I have experienced clean clear good tasting water ever since I put these filters in! The alkaline remineralization really does put back some nice minerals and I’ve noticed the water is more tasty than the plain RO filtered water. The filters are well-made and fit perfectly into my system without leaking or any other problems. The only thing that I find sort of a pain is that it’s hard to tell which specific filter is which until you open up the individual plastic bags - some are very similar looking, and the outside packing is not necessarily clear concerning which bag has which filter. It would be much better if they each sealed bag had some clear printing on it of what type of filter is inside it, and the stage number it belongs to. Occasionally, I have to open one up just to make sure it’s the right filter, and that is a bit annoying at replacement time. Overall, each filter works like it should and lasts the whole year as advertised! Worth the price and it was easy to replace. It is compatible with my iSpring 6-stage.

The filters are good quality and not too difficult to replace in my RO system. Overall, I have been very happy with my iSpring system. However, after today, I can vouch that their customer service is also top tier! I ordered this one year supply during prime day deals and should have opened the box right away. However, I didn't because they weren't due for changing yet and I found the box that Amazon sent was missing 3 of the filters. I went ahead and placed another order so I had them, but now I have an odd assortment of filters. I called iSpring's customer service line and talked with Nick and he is going out of his way to help me get the missing filters replaced. This is 4 months after my initial order (and I think it was more of an Amazon issue not iSpring) so he would have been well within his rights to tell me I am out of luck but he didn't. It is hard to get that level of customer service these days so I appreciate it and I will spread the word about their products and customer service from now on! Thank you, Nick!

I've had an iSpring system for 10 years now and have been ordering replacement filters since then. the system works great, and everything is holding up as they say. On this order, there was an issue with one of the filters not sealing properly, so I had to concate customer service. They were responsive and sent me a replacement filter right away.

Was worried this product wouldn't work as advertised but it did. I connected this filter after post carbon filter on RO system. Water is also treated pre the RO system with having a water softener with additional sediment filters and UV. Did before and after testing of the RO water. Water becomes TDS 26 from 7 and a PH of 10.01 from 7.20. No noticeable weird taste or smell. Seems to perform as expected. Had to go up a size from filter tubing to supply line to home. Don't know why they choose to have the flow be smaller tubing if you are supposed to attach this after post carbon. My post carbon is the larger size and so I have to down the size and up again.