iSpring CU-A4 0.01μm Ultra-Filtration Under Sink Water Filter System, Tankless 4-Stage High Capacity, Remove 99.99% Contaminants, Quick Filter Change with Brushed Nickel Faucet, White

This is a large 20 gallon tank that holds roughly 14 gallons of clean water for a reverse osmosis system. As a disclaimer, this arrived dented for me, but Sean from iSpring's customer service was wonderful to work with, and he quickly sent a replacement tank that arrived in perfect condition. This has multiple connectors provided, and the connections are done at the BASE of this unit. This works best with 3/8" line. The top part of the tank is where the bladder is, and the water sits near the bottom. This arrives charged and almost ready to use. They recommend flushing this once filled to ensure it is clean. I HIGHLY you do that with tap water prior to using. This takes forever to fill with RO water, so tap is much faster. Enough connectors were provided that I was able to hook this up to a utility sink to fill and drain this several times before install. This works just as well as smaller tanks, but the pressure is maintained much longer with this size tank. Overall, I am very happy with the performance and value of this tank.

Edit 2: It's November 2023, 5 years later, still working A-OK. The espresso habit acquired last year now also demands tasty water, lol. Edit: 2.5 years and three sets of filters later, still no issues to report. I made a couple tweaks below. Read #1 - very important! This is a great filter for anyone who wants to leave the good minerals in your water and filter everything else out. The only better filtration is reverse osmosis, but it needs its own separate storage tank so the water is just room temperature, and it has a metallic taste and low water pressure = slow flow. After significant research we decided on this filter for all the reasons above. This fit the bill perfectly with a healthy four filtration stages, great flow and no RO! I had it running in a half an hour with simple inline connections to the 'fridge water line and it eliminated the pesticides and city water taste instantly. Important Notes: #1) This one tip might save you from expensive plumbing repairs down the line and is something you need to know before you install this unit. TEST YOUR WATER PRESSURE! This filter needs to be run at under 80 PSI. There are various $10 simple screw-on testers like the Watts IWTG that take seconds to use. I attached the tester to our backyard hose hook-up and discovered we were at 80 PSI. We then tested my in-laws' house and they were at 92 PSI. No big deal right? Well residental water pressure should be under 60 PSI, ideally 50 to prevent water hammer (banging pipes) and damage to copper plumbing pipes over time! After installing a water pressure regulator on the main water line in the basement ($100 from local hardware store and a couple hours' work) we immediately noticed the pipes wouldn't bang when we flushed a toilet, or when the clothes washer ran. Plus, the filter was now right in its sweet spot of 40-80 PSI. If your water pressure is over 60 PSI, at the very least add the iSpring APR40 to your purchase to reduce the pressure to this filter to 40 PSI and help protect it from damage. #2) As others have mentioned there is a slight oily sheen in the water upon first installation. The oil is there to help seal the cartridges. Simply run 15 gallons of water through the filter to purge it all out, really not a big deal, see images 2-3. Residue and cloudiness are common to nearly ALL water filters upon first installation and the 1-star complaints are indicative of inexperienced DIYers. #3) The included push-to-fit 1/4" water line couplers work on both Copper and PEX/plastic tubing as they are both relatively soft materials with the same outer diameter Water tastes like bottled now and we're extremely satisfied, plus no more pesticides. If I have any problems, you know where I'll be posting them!

Update: As per my review below, I had some trouble installing due to instructions that were not really clear or suited to this particular product, which Ispring says is brand new. Since then they actually tracked me down and cared about what I had to say. According to them they are rewriting the instructions, not shipping with the funny dust caps, and considering additional parts to make the installation go smoother. I was impressed because in this day and age few companies actually seem to care about what their customers really think. I have come to the conclusion that this company does. And the filter system is now working fine, so don't hesitate to buy. I'm leaving my review below in case it takes a while to update the instructions. It might shave a few hours off someones install time. Changed to 5 stars. If you have any problems they will definitely help, and that is a really good thing. ================================================================ Just finished the installation. I'm a pretty handy monkey, but the installation took about 5 hours of my time (including 3 trips to the home improvement store and a some-what helpful phone call to ispring). First-off the manual is misleading and clearly written for another product or previous version of this product (or maybe a new-fangled sausage making machine). The parts of the manual that do apply to this product, like how to connect the little push-on connectors, suffer from an excess of brevity and lack of detail and conciseness. In an attempt to be helpful to future purchasers of this product, at least until ispring updates these kits and instructions, here's what I learned: First tip: the faucet included in my box does not require a 1/2 inch hole, as the instructions state, but a one inch hole. Actually one inch is too tight, make sure you have a 1 1/8 inch hole saw attachment for your drill, and make it a good bi-metal one if you need to cut through a stainless steel sink. Home depot sells rigid brand bits that suit this purpose. It will run you about $15 unless you already have a rigid brand bit shaft (or equivalent). Second tip: the faucet that came with my filter has three colored plastic hoses already permanently attached. Red, white and blue (I dig the patriotism). Unfortunately which gets attached where is not mentioned anywhere in the manual. In the manual it says to screw the water hose to the bottom of the faucet. Clearly referring to a different type of faucet. Also if the three hoses were just a little longer you would probably not need to bother adding extension hose (an extra leak risk). More on extension hoses later. The colors are mentioned in the Amazon description, way at the bottom, but it bears repeating. "Connect the BLUE tubing of 3-color tubings on the faucet to cold water line, RED to the 1st stage on the right, WHITE to the 3rd stage on the left." Note: This is #ssbackward if you are from an English speaking country ... just saying. Third tip: The filter box itself has funny little horn or funnel shaped things on the ends of the inlet (left) and output (right) angle connectors. These are not mentioned at all in the manual. You can not push the hoses on with these in place (you can try as I did ... if you get excited by frustration) because these are some weird sort of dust plugs. You must pull up with your fingernail on the very outer ring of the connector (pushing it on a spring ever so slightly towards the more bulbous part) then with other hand pull the horn thing out. You can discard these, or I found they make nice hats for very small garden gnomes. Basically you can connect the red and white hoses now by pushing them with force into the connector until they snap. Pull back a little to make sure it is connected. If you need to cut extension hose cut it straight, and use the supplied double-sided connectors. I recommend you push the little blue horseshoe shaped clips (supplied) between that outer part of the connector and the more bulbous part. These (I think?) are to make sure the connectors can't shoot apart from water pressure. No mention in manual about these. You can leave them off, as I did at first, if the under side of your sink needs a good spraying out. Fourth tip: In order to connect the blue hose to the cold water line you need to first install some parts. My sink had a 3/8 inch stainless steel hose with female compression fitting attached to a male 3/8 compression fitting shutoff valve coming out of the wall. Pretty typical I would assume. The kit comes with a 1/2 inch plumbing style thread, male to female connector, with a hole to thread the valve the blue hose goes onto, in the middle. A way to tap into your cold water line, would be eazy peezy if it was threaded for 3/8 compression fittings, but it's half inch and has coarser plumbing style threads. So off to the Home Depot you go. Don't forget another roll of Teflon tape to add to your Teflon tape collection while you are there. Actually the folks at the Home Depot weren't that helpful (surprised?), but the small local hardware store in my old town was. You will need, as it turns out (if your sink is like mine) a 1/2 inch plumbing style male to 3/8 inch compression male adapter to connect your current hose leading to your cold faucet to this new part (btw thread the little supplied valve the kit came with into this part with a little teflon tape first so you can get it good and tight before you are lying on your back under the sink). Then on the other end you will need another short stainless hose (only way I can find to do this with available parts ... why it took three trips) 1/2 inch plumbing female, which attaches to other end of this new part, 3/8 compression female which connects to the part your faucet hose used to be connected to. These parts should run less than $15. Tip five : To connect the blue hose to the metal valve from the previous section you need to put it against the nipple, screw off the nut collar and slide it down the hose temporarily, then push it on the nipple all the way, and man it's a tight little bugger (I sprayed the nipple with a little Pam cooking spray, hey it was in the kitchen), then put that nut collar back on and tighten it down real tight with a half inch wrench. Why these filters don't come with a 3/8 inch compression fittings on each side of the filter box, so you can just screw your standard hoses on that you can get from any hardware store, is beyond me. There must be a reason. Maybe these filters are designed by the same folks who design those charming "blister packs" that you need a chainsaw to open? When I tested the water it was cloudy and tasted a little funny, it got better after I ran the tap for a while. Now it tastes pretty darn good. Even my cat likes it. Hopefully it will not develop leaks.

Replaced my under the sink filtration system with this one. It does exactly what it is advertised to do. I did have a small leak at the head and called their number and spoke to Sean. Within 3 minutes they authorized to ship me a new unit. Great customer service!!! I am not all worried about the quality because this unit is pretty sturdy compared to others. Just keep in mind, anything mass produced will have a quality issue every once in a while so I will chalk this up to one of those instances. Just keep in mind if you are replacing an existing system, it is probably 3/8 tubing. If you want to keep the 3/8 tubing eliminating the need to re-hose everything under the sink, just go to Home Depot and get (2) 3/8 to 1/4 couplings and use about 4 inches of the supplied 1/4 tubing to use as a link from the filter head to the 1/4 end of the coupling. Works like a charm with no leaks.

Product: iSpring T32M Pressurized Water Storage Tank with Ball Valve for Reverse Osmosis RO Systems, 4 Gallon, 1/4" Tank Valve Included Purchased: 1-10-2024 Received: 1-12-2024 Reviewed: 2-5-2024 I replaced a faulty 2.8 gallon tank with this larger 4 gallon "iSpring T32M Pressurized Water Storage Tank with Ball Valve...". We drink RO water for health reasons. Since we were without RO water due to the faulty existing tank, I promptly installed this new tank. Unfortunately, I did not realize that the tank came with a 1/4 inch fitting, which is too small for my existing water line! Since I was installing a larger tank, I didn't consider the new fitting being smaller than the fitting on my smaller tank. The only reason I did not give this product (5) stars is because I had to swap out the included valve with the valve from the old tank. This is because the existing plastic RO water line is larger than the supplied 1/4 inch valve fitting. This is my mistake for not noting it when I purchased it, but then too, since this is a replacement product, the supplier could have easily provided the optional size valve with the tank, making me and all future buyers VERY HAPPY! Fortunately I had the old valve and it fit the new tank without any problem! If I didn't have the replacement valve then I would have been out of luck installing the new tank. Since I was able to quickly replace the valve, I was able to install the tank and everything is running GREAT! We are really enjoying the larger capacity, and we never run out of on-demand RO drinking water! Now we can fill all of our backup water jugs without running out of pressure and water. Perhaps the company can include multiple fittings of popular sizes so this doesn't happen to the next buyer! All the tubes in our RO system came with the RO system and were installed correctly. The mismatch fitting was not anticipated since we assumed our RO system and the new tank to both be standard.

The installation went smoothly (as far as plumbing goes). Put it all together and no leaks. The faucet has a surprisingly strong flow, much more than expected. We live in the mountains and have very good water to start with but wanted to take out heavy metals, chemicals, etc. The water coming out of the tap tastes very good and is probably on par with a decent bottled water.

So far I am satisfied with this RO tank. The initial bladder pressure was a little low but I added air to bring it within specs. Works great and excellent water flow! Great customer service if needed too!

I am a General Contractor/Home builder. We originally had a RO system that provided us with excellent tasting water, but took up most of the under-cabinet and had to be sanitized with bleach at each filter change.. We don't have hard water and our tap water is drinkable but we wanted it cleaner, and the RO had intermittent leak problems. Could I find a system that would relieve us of the clutter , the maintenance, the water leaks under the cabinet, and still get great water? I decided to give the CU-A4 a shot. SO, Here goes what I didn't like, and then what I liked: CONS: 1. The directions do NOT adequately describe how to make the water connections. To someone who has installed with these type connections it is an obvious "no-brainer", but to the rest of us......... Parts of the directions appeared to be for a different unit, and especially the section on installing the faucet, which was obviously from their RO system and was not anywhere close to describing the faucet enclosed. The faucet enclosed is an "air gap" style which requires a hole in your sink deck or in your counter of 1 1/8" minimum. The threaded pipe that will go through this opening is 1" in diameter. If your existing hole is anywhere from 1 1/2" to 1 1/8" the provided washer will work fine. 2. While there was plenty of 1/4" tubing to do the installation, There are 3 colors of tube, red, white and blue. They provided plenty of blue and white, but not red, therefore I used white and labeled it red to make the job a clean install. 3. There is no discussion in the manual of run-in time after completing the install. The water was barely drinkable after letting it free-flow for approximately 10 minutes as suggested in the notes . After flushing the system with approximately 15 more gallons the water was crystal clear and the flavor has become progressively better and better and has stabilized. PROS: 1. The system IS actually easy to install when you have familiarized yourself with everything they have sent and how it will work with your existing plumbing and sink. AND you have purchased anything you might need so the system will integrate seamlessly. 2. The snap-fit connections work great and do not leak a drop. 3. Twist on replacement filters. How could it get any simpler??? 4. Takes up minimal space. 5. The faucet is all metal construction. 6. After initial flushing and after the first week of use (approx. 1 Gal per day)t the water tastes GREAT. As good or better than any of the bottled waters we have tested against. 7. Every time I have called them (of course during business hours...duh...) they have been very responsive. So, customer service gets a nod. CONCLUSION: Well worth the money, Simple design and install Great tasting water NOTES: 1.There is a review about salt taste. If you have softened water, then you may want to contact your service company regarding what is best to work with your existing system. At the very least do an internet search on how softeners and filters can work together before purchasing this system. 2. There are reviews that mention a 1/2" 3-way valve and having to buy adapter fittings. My system came with a 3/8 to 3/8" 3-way valve (which worked perfectly), so it seems iSpring has changed it to the more typical size. 3. One reviewer gave 3 stars because this system does not reduce TDS and it cost them 10% restocking to return it. TDS is reduced by RO systems, This is NOT a RO system. iSpring does not claim reduced TDS. If you need reduced TDS...iSpring has a very highly rated RO system ( http://www.amazon.com/iSpring-RCC7-Reverse-featuring-See-through/dp/B003XELTTG/ref=cm_cr_pr_product_sims?ie=UTF8 ) for about $200.00. 4. Most every review says the directions suck. I can attest to that. They do! Layout everything from the box, familiarize yourself with it, identify any problems with your existing plumbing. Take the 3-way valve with you to your local home improvement store and buy whatever you need. 5. Make certain you have the correct tools to accomplish the install. 6. For a water tight connection fit, remove the blue "horseshoe" clips and FIRMLY push the 1/4" tubing approximately 5/16" in to the couplers until you feel it "bottom out", check the assembly by firmly pulling on the 1/4" tubing. Replace the blue clip. 7. I made all of my tubing the same length and long enough for me to remove the filter manifold a couple feet from the cabinet to facilitate changing the filters when that time comes. The tubing is coiled and taped up (love that blue tape), and will be easy to undo and stretch out. 8. I purchased an extra set of filters ahead of time, and store them right next to the unit. 9. Instead of changing my filters by use of a calendar (such as recommended by the manufacturer, every 6 months), I will change them based on usage. Since we only use it for drinking and cooking, we likely will never hit a max avg of 3gals per day. Most filter manufacturers claim 6mos. is relatively equal to 1200 Gals. Therefore 3 gals x 365 days = 1095 gals. (1095 is approx 90% of 1200 filter life). That is when I will change mine, at about 1 year. You also can adjust your schedule based on this formula. If you use 6 1/2 gals per day, you will hit the 1200 threshold at about 6 months. Were you to use 10 gals per day you would want to replace the filters after 4 months. AND so on. If you don't have a basin wrench, get one from your tool store, (see images) Make your life easier.

Wer eine zuverlässige Speicherlösung für seine Umkehrosmoseanlage sucht, trifft mit dem iSpring T32M eine sehr gute Wahl. Meine Eindrücke: Ideale Kapazität: Die 12 Liter (3.2 Gallonen) Bruttovolumen sind absolut ausreichend für den täglichen Bedarf. In der Praxis reicht das gut für einen 2-Personen-Haushalt aus, um immer genügend gefiltertes Wasser parat zu haben. Qualität: Der Tank ist top verarbeitet. Die Materialien wirken hochwertig und die Tatsache, dass er lebensmittelecht ist, gibt ein sicheres Gefühl bei der Trinkwasserlagerung. Anschluss: Der standardmäßige 1/4"-Anschluss macht die Integration in bestehende Systeme kinderleicht und hält absolut dicht. Fazit: Ein grundsolider Wassertank, der genau das hält, was er verspricht. Für Paare oder kleine WGs die perfekte Ergänzung zur Osmoseanlage. Klare Empfehlung!

My Experience with the iSpring CU-A4 Under Sink Water Filter I recently installed the iSpring CU-A4 under sink water filter, and I'm genuinely impressed. As someone who's always been a bit skeptical about the true efficacy of home water filtration systems, this unit has completely changed my perspective. First off, the installation was surprisingly straightforward. I'm no plumbing expert, but the clear instructions and well-organized components made the process relatively painless. Within an hour or so, I had fresh, filtered water flowing from my dedicated faucet. And what a difference it makes! The most noticeable improvement is in the taste and smell of the water. Our tap water, while generally safe, often had a slight chlorine odor and a somewhat metallic aftertaste. With the iSpring CU-A4, that's completely gone. The water is crisp, clean, and incredibly refreshing. It's truly a pleasure to drink, and I find myself reaching for water more often throughout the day. Even my coffee and tea taste noticeably better. I also appreciate the compact design of the unit. It fits neatly under my sink without taking up an excessive amount of valuable cabinet space, which is a huge plus in smaller kitchens. The dedicated faucet is sleek and unobtrusive, blending well with my existing fixtures. While I can't scientifically measure the contaminant reduction, the peace of mind knowing that my family is drinking water filtered through a reputable system is invaluable. The four-stage filtration process, including activated carbon and ultrafiltration, gives me confidence that we're significantly reducing chlorine, sediment, and other common impurities. In conclusion, the iSpring CU-A4 under sink water filter is an excellent investment for anyone looking to improve the quality of their drinking water. It's easy to install, produces great-tasting water, and offers genuine peace of mind. Highly recommended!

Super easy installation! Very tasty water! Took away the tap water smell, and it does make a big difference although Amsterdam has one of the best tap water in the world! Quality product

I use this product to filter water for our production process as well as for drinking. I did need some hoses the larger tank did not come with so I called up Richard and he was able to help me out with some complementary hoses. I was up and running within a week!!

Came with only one size valve (1/4" I believe), naturally I needed a 3/8" od. Easily obtained. Works good! My RO system is back up and running.