APEC Water Systems ULTIMATE Series US Made Stage 1, 2 & 3 Replacement Filter For Undersink System(FILTER-SET)

I’ve been using this APEC replacement filter set for my under-sink RO system, and it’s been excellent. The quality is immediately noticeable everything feels well-made, and installation was quick and hassle-free. What really stands out is the improvement in water taste and clarity. The combination of the sediment filter and carbon block filters does a great job removing chlorine, odors, and fine particles, leaving the water clean and fresh. I also appreciate how long these filters last. They’re designed for extended use (around a year depending on usage), so you don’t have to constantly worry about replacing them. That’s a big plus for both convenience and value. Another thing I like is the compatibility it fits perfectly with my APEC system and works with standard 10” reverse osmosis setups, which makes it easy to stick with a reliable brand. Overall, this is a dependable, high-quality filter set that does exactly what it’s supposed to do. If you want consistently clean, great-tasting water and an easy maintenance routine, this is a solid choice.

I've had a 5 stage reverse osmosis APEC system for about 6 years. I use it frequently and the system is easily accessible. These need replaced about once a year. I can replace them all in about 3-5 minutes and I've yet to have a problem. The water quality is fantastic. I use it for drinking, auto top off on aquaculture tanks, and hydroponics systems.

I LOVE APEC. I have had their R90 reverse osmosis water filter for 9 years and with the kit to feed my refrigerator. Never any issues and the water quality is excellent. Their customer service is great and very knowledgeable. You are not getting anyone who is reading a script!!!!

We formally purchased another line of filters for a different under-sink RO system and would spend $200 every 3 months and it required us shutting down our system and purging it for 24 hours. This system can be used within 15 minutes of installing/replacing filters. The water quality is even better. Although the filters do create waste once you dispose, it isn't in comparison to the hundreds of plastic bottles that create even more waste and hazards. We live in a town where water filtration is subpar and very hard. The drinks you make with our water vs. this filter can't compare in clarity alone. I only gave it 4 stars for installation due to the fact that most under-sink units aren't easily accessible and require some maneuvering on floor level, but overall straightforward. We date and mark each filter with the corresponding order of installation to ensure we properly install them and change them out timely. In the pictures you will see a glass of tea, with the same tea concentration, with the same steeping times, same brand. The difference is one on the left is from the tap source no filtration and the one on the right is filtered with APEC. The smell alone was a stark contrast before the clarity and taste was addressed. We used a flashlight to show the murkiness of the one on the left (a) vs. the one on the right (B) in two of the pictures. Just an overall great investment.

I have never had an issue with these filter cartridges. I always test my water from time to time and it is spot on. Highly recommendable

A spec'd product. Easy to install. I wouldn't use any knock off

Been using these MADE IN USA from Apec filters for many years. I use them for an old reverse osmosis unit that I removed the top membrane filter. These three filters work perfectly to make the Las Vegas water more pleasant to drink from my fridge water dispenser. I have a bypass installed so I don't need to buy those expensive fridge filters that don't do much to improve the taste of the water and ice.

They work wonderfully and I will keep ordering these for my RO system.

Not yet use since we still have another.

Made in USA, recommended

This water system is wonderful. Filters are great. After using this, water tasting much better ! I will continue buying again when filters need to change.

Used to get this from AMAZON US but they are no longer shipping to Singapore. So I am very happy to find it on AMAZON SG, and at a reasonable price too.

This filter is absolutely amazing!! I love it! We used to use a Brita filter and I hated cleaning it and refilling it all the time. This was a one time installation and we have the cleanest water. It tastes just like good bottled water. I use this water for everything from my washing produce, filling up my water bottle everything!! I highly recommend you buy one especially if you have bad tap water in your area and have a big family. I hope the water tastes as good in 6 months time as it does now.