APEC WATERSystems 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.

Delivery was super fast and these fit perfectly. After you turn the water back on, open your drinking water on if possible but only a drip. Your system will gurgle a bit while all the air is purged out. After the air is gone and the tank is repressurized, the good water flowed great

Always use original equipment filters every year. Keeps everything working well.

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.

2nd UPDATE: I had lowered the number of stars because we were getting a lot of mineral build-up that we didn't get with the original set, but to be fair, the product doesn't claim to remove minerals. I know these filters are not designed to specifically filter out minerals, however, the first set we had that came with unit did do a much better job than these so I have nothing else to compare these to. I will say that after a few months, they do seem to be filtering out more hard mineral, probably because they are getting full, and honestly, that's fine with me because I clean my electric kettle less often. That said, the water still tastes GREAT! The old and new filters have always improved the taste of our water 1000%. Hard water can taste very nasty. Plus, the APEC people recently contacted me and have sent another set of filters just because they are nice people and want me to be happy with their products. I still don't know why the first set filtered minerals well even though it wasn't supposed to. But I'm thrilled with the APEC water filter at our kitchen sink. We drink this water and I often use it for cooking, too, just to minimize the harmful garbage normally found in tap water. Thanks, APEC!Original Review: Only four stars because even weeks after changing filters, we are finding a huge amount of mineral sediment in our electric kettle. We have hard water and we know not to expect any of our filters to completely get rid of mineral build-up. While these filters do improve the water taste considerably, the original filters included with the unit did a much better job at filtering minerals. Yes, we still had mineral build-up but not to the point of having to clean the kettle twice a week with vinegar. We only used to clean it once a month. I don't know why they are not as good as the previous set.

Great packaging. Easy install. Will buy again!

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.