iSpring RO1200AK Dual-Flow Reverse Osmosis Water Filter, 1200 GPD Under Sink Tankless RO System, pH+ Alkaline Remineralization, 3:1 Pure to Drain, Auto Flush, TDS PFAS Reduction, Filter Reminder

I purchased this iSpring RO1200AK tankless RO system to upgrade my kitchen water filtration, and it has been an absolute delight. It was super easy to install, and the water flow rate is surprisingly fast and powerful!Why I’m giving this iSpring RO System 5 stars:Super Easy to Install: The instructions were crystal clear and the quick-connect fittings made the under-sink installation completely straightforward. I had the whole system hooked up and running in no time without needing to hire a plumber.Incredible Water Flow Rate (1200 GPD): Unlike traditional RO systems that produce a slow, weak trickle, this unit outputs a fast, strong stream of water. Filling up a large pot or a water glass takes literally seconds—no waiting around!Smart Dual-Flow Faucet: The dual-handle faucet is brilliant. The right side provides crisp, alkaline RO water for drinking and coffee, while the left side offers fast carbon-filtered water for washing fruits and vegetables. It saves the RO filter life while keeping daily kitchen tasks super efficient.Saves Under-Sink Space & Real-Time TDS Display: The tankless design frees up about 70% of space under my sink. Plus, the real-time TDS display right on the faucet gives me total peace of mind regarding my drinking water quality.Verdict: An outstanding, high-performance reverse osmosis system that delivers effortless installation, incredible water pressure, and crisp, great-tasting mineral water.

Negative:-If you run it past 30 minutes it shuts off which I ran into when flushing the system so there is an extra cost of buying a remote on-off switch so no one has to crawl under the sink to unplug the system and plug it back in too reset it or even change filters. Needs a power/reset switch or switches on the main ro unit. One of the main selling points of a tankless system is supposed ease of use.-Not a continues duty pump. So a 30 minute maximum runtime. Not a big deal to me, but might be for some.-High tds after being in standby so a flush is needed. I have seen the tds get down to 4 if I wait long enough, but I don't flush that much water down the sink. Which means I have to keep water containers if I want clean water without throwing away too much water to get there.-Nothing mentioned about ice maker hookup in ad that I could find. I noticed the pump cycling on-off when the ice maker was filling so I purchased a small 1/4 gallon pressure tank that mitigated the issue.-I put a pressure gauge on the outlet water line and the pressure that the booster pump shuts down pegs my psi pressure gauge at over 100psi then settling down to about 100psi after awhile(my pressure gauge goes to 100psi). While its running it is not that high a pressure, but I did not check running pressure. I am using all high pressure rated fittings and water line like at the t-junction(spigot and ice maker) just in case. The on and off pressure at the outlet should be in the specs. At least I could not find it if it is.Edit: I checked the water pressure between the tank and the ice maker with a gauge after I added the small tank and my input pressure is about 40psi and now the shutoff pressure is around 40 psi too. The tank changed the cutoff pressure from over 100psi to 40. Hmm. Don't know why but I suggest at least a small tank. I use 1/4 gallon.Positives: Easy install of filters. Fairly quite for a booster pump system. I ran a booster pump and a permeate pump on a 20 gallon tank system for years so I know there not silent.Fast water flow rate, more than a 75gpd ro system with a 20 gallon tank at 60psi and it stays high(at least for 30 minutes at a time).Neutral: Since I am having to add a small tank and my old ro tank was not under the sink to start with, the space savings is nil with subtracting a pressure pump and a permeate pump but adding a small tank.-I also bought water stands and water dispensers for 5 gallons of water storage. I fill the dispensers by having a t-fitting under the sink and running a 1/4 inch line with a on/off valve at the end of it to the dispensers. I won't move water dispensers around the kitchen. One thing I noticed, getting the water from the 2 gallon glass dispenser is way faster than the RO spigot even if the RO membrane has already been flushed. So lose time filling the dispensers, but gain time filling the drink glasses. I also added a one way check valve to the reject water line(so in case the sink ever gets plugged) and a inline post carbon filter.Now its just how long it will last before parts needed and a parts list to find them if available. My old tank RO system was about 25 years old with easy replacement or add on parts if needed.Edit: Before with the tank system, I would add unfiltered water from the faucet back into the RO water to raise tds for making coffee(for flavor) and RO water is corrosive on metal parts. The RO spigot is not used after I fill the water dispensers except for filling the coffee maker's tank, so the tds after filling the coffee machine tank without flushing first will be around 100-125 which is fine for coffee and I don't have to mix RO water with tap water. That was something I wasn't expecting when I purchased this unit. Plus it keeps water flowing through the RO system every day or two between water canister filling. I also added a camera so I can watch the filling of the water canisters from the comfort of my office chair :-)

This is an excellent RO system. I wanted RO water with low TDS for my faucet and to feed a DI-water filtration system to obtain RO/DI water, thus extending the life of the DI-water filter by decreasing the salt load in the water source and reducing the fouling that occurs by microbe contamination (RO membranes filter microorganisms as only water molecules can pass, whereas DI resins do not). My tap water is decent, coming at about 105-125 ppm TDS.I bought the RO800G system, which claims an output of 800 gallons per day. I measured the output several times and always obtained 0.60 gallons per minute, which equals 864 gallons per day. So, their claim is even conservative. You can fill a cup or a jar with water in no time. More importantly, the water comes at 4-5 ppm TDS after the RO filter. Even with this low TDS, the water tastes great. Note that TDS levels or pH are best measured with an inline probe, where the water is running unexposed to the atmosphere during the measurement for the most accurate results.Installation was straightforward. The push to connect/disconnect joints makes it really easy. The unit fitted under a crowded sink, so that made me happy. The pump makes some noise when water is being filtered, but it does not bother me.I wanted to extend the use of the RO system to feed other devices with RO water, including an ice maker. However, the system would not work very well for that. So I called iSpring customer support to see if there was a workaround. Nick on the phone was great and helped me with implementing an easy solution. He was very kind and knowledgeable about water filtration and iSpring systems. So I rate customer support five stars.Finally, installing the filters was very easy. Apparently, replacing the filters is very easy, too, as you don't have to have a special tool to struggle to unscrew the filters as you have to do with the most common simple filters found under kitchen sinks. With this system, you don't even have to shut off the water before replacing the filter. I look forward to testing that.The blue light on the faucet, indicating that the system is working, is cool too. Overall, I'm very happy with this sleek tankless RO system, which is performing better than I wished for.

I’m really impressed with the RO10001F Tankless Reverse Osmosis Water Filter. The water tastes noticeably cleaner and fresher, and it has made a big difference compared with using regular tap water. I especially like the tankless design because it saves space and gives the kitchen a much cleaner look.The system is easy to use, works quickly, and provides great-tasting filtered water whenever I need it. Installation and everyday operation have been straightforward, and I appreciate not having to deal with a large storage tank taking up cabinet space.Overall, this has been a great addition to my kitchen. If you’re looking for a convenient, space-saving reverse osmosis system that delivers clean and great-tasting water, I’d definitely recommend the RO10001F.

Title: My kids actually drink more water nowGot this for the remineralization and it delivers. The water has a nice mouthfeel, not flat like regular RO water. My kids drink more water now which is a win. The system runs quietly and the auto-flush takes care of itself. I also appreciate how much space it saves under the sink – no big tank to work around. Customer service was responsive when I had a setup question too. Solid system overall.

Really happy with this system. The water quality is noticeably better-my coffee tastes smoother and I don’t get that chalky residue in my kettle anymore. I love that the faucet shows the TDS reading so I can see it’s actually working. Water flow is strong, much better than the old unit I had. It’s quiet too, I barely notice it running. Good purchase.

I bought this in large part due to the countless people raving about their customer service in the reviews. I have not found that to be the case at all. I realized that this system doesn’t remineralize the water and that the issues my family has been having could be due to a lack of magnesium from this. I called and emailed ispring. I left probably 3 messages. No one ever called or emailed back. I was interested in possibly attaching a remineralization filter to this system. Or trying to make it work. Unfortunately now I’m thinking I just have to trash it and get something else. It’s very disappointing. Such a waste of money. Just a warning, not remineralizing your water can really cause issues. Don’t get this RO system. I wish I knew this before I bought it.

This iSpring RO600 is excellent!I purchased this iSpring to replace a 5-stage RO system with a tank (a different popular brand), as I had bought replacement membranes for that system, but they produced a weird and horrible taste. When I contacted that former RO's customer service, they were difficult to get a hold of, then rude on the phone when I finally got through, then asked to send in pictures of the faulty system and filters via email. They ended up not helping us and were rude in the non-ownership of the problem their replacement filters had created.That lead me to research a lot of systems here on Amazon and decided to purchase this iSpring system because of all the wonderful features.The RO600 takes up less than half of the valuable under-sink space that the former 5-stage did; it is sleek-looking; and the water waste for purification is less than half of that of the 5- stage, which translates into more money in my pocket at the end of the month. I will never go back to a tank! The RO600 is very quiet and the water the iSpring puts out is clean, clear, refreshing, and tasteless. The RO600 puts out water much more quickly than my old system. Also, there is no guessing if everything is okay with the iSpring, or if a filter needs to be replaced, because of the 3 LED lights on it.It is also an easy process to change the 2 membranes, unlike traditional RO systems. So you don't end up with water all over the floor and old filters in your sink draining for hours after changing the 5 different membranes. The iSpring is plug-and-play and you don't need a special wrench for the task! The filters are very affordable when replacement time rolls around, especially since one of the two membranes only needs to be replaced every 2 years, and the second one, once a year. This saves a lot of money compared to 5 + membranes replaced each year with other systems. It comes out to less than $1.50 per week for a 600 gpd RO system.If you have any questions regarding the system, the customer service is outstanding. There's someone who can answer your questions that's based here in the U.S., and you feel like a valued customer. This is a night-and-day difference from my other experience, and I will be an iSpring customer for life!Finally, there were some reviews stating that it couldn't be hooked up to a fridge. Ours is spliced out to our 2012 Maytag and it works just fine. It has a tiny delay the first 1/4 second of operation, but runs smoothly after that. (I believe it's just the length of the connecting line, combined with gravity.) This does not bother me and I really wouldn't think anything of it, other than trying to be 100% honest in a review.I'm glad I chose the iSpring RO600 for my home. It was a great financial and healthy investment for clean drinking water for my family of four and a total upgrade from my old 5-stage RO system with a tank.