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

They are the correct filters for my APEC system under my kitchen sink. My wife swears it makes the water taste better, but I can't tell much of a difference. When I change them, they aren't super dirty, as we have a pre-filter as our first line of defense. That gets a little rust-colored over time, but these always look clean - I just changed them every so often because I feel like I should. They fit fine, seem to work as designed, and I don't have any complaints.

Great product now just need parts 4&5

Exact replacement for my filter system.

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.

This filter set works with our APEC RO-90 and seems to do the job well, but I was surprised by the updated design for stage 1 and stage 2 filters, which are now wrapped in a plastic mesh/netting that wasn’t present in previous versions.I’m using this system because I want the cleanest water possible that is low in TDS, free of contaminants, and ideally with minimal plastic exposure. That includes things like microplastics, manufacturing residue, or anything introduced during filtration.So, when the filters arrive wrapped in plastic mesh, it feels like it contradicts the goal of purification. It’s also a visible reminder that my water passes through plastic layers.I’m not just filtering water. I’m filtering out all the stuff I don’t want to consume chemicals, toxins, microplastics, residue, whatever’s unnecessary. If the filtering system itself reintroduces plastic into the path, it begins to break my trust in the product. My goal is the cleanest water possible, so why add plastic back in?I’d love to see a low-plastic option.

This RO system is well-designed and the water tastes fantastic. It was installed by my plumber in about 90 minutes. The replacement filters are reasonably priced and readily available. I like that I only need to change the 3 base filters once per year and the other two filters (membrane and filter 5) every 3-5 years. The faucet works well, no leaks anywhere and the water pressure out of the RO faucet is strong enough to fill up an 8 oz glass in about 5 seconds. Overall, I am very happy with APEC Water Systems. Also, I might mention, I called the company and I actually spoke to a real person (not a computer) who told me all about the replacement filters. Very helpful customer support. Highly recommend APEC!

Good quality filter sets for the price. Very easy to install.

This is the third year I have gotten these. I have a APEC water system in my home as I don't like drinking chemicals and I use water to water plants and they don't like the chemical either. These filters are easy to change. I am 69 and I can change them. They work well and love that my water taste good and it is good for what I grow.