Stokk 8 Stage Reverse Osmosis Water Filter, 600 GPD Tankless Reverse Osmosis System, Under Sink RO Water Filtration System, Reduces PFAS TDS, 2:1 Pure to Drain, NSF/ANSI 58& 42, FCC Listed, S1 Pro

Working as advertised. The install took a little more than 40 minutes. Not difficult, but definitely easier when I was younger.I no longer have to make trips to get bottled water so it will pay for itself in short order.I’m happy with it

This thing works! I bought a water test kit and tested before and after. Big difference in particles. Then, I also tested against my neighbors PRO unit that was much, much more money. Nearly the same reading. I will say hers has a better flow.. but not that much difference that I would pay for a premium install. Faucet seems identical to hers as well. Had it for about 6 months. Love it. The was is a bit “tasteless” but I have become accustomed to it.

I am not new to under sink water filtration. I have been using them for years. This is my first tankless RO system. I replaced a frizzlife 3 filter water purification system with this Stokk RS1 400 gpd because I needed RO water for my humidifier. I have a matching drinking water faucet and sink faucet so I did not need the included RO faucet. The installation was a breeze as the only thing I needed to do was add a drain saddle connection. The creative water tube connections to this box was a cinch to use. Because of the RO membrane, water output will be slower than your average charcoal filter system, keep that in mind. Most will opt for the faster 600 gpd unit but if you dont want to replace your expensive membrane any more than a once a year, you should stick to the 400 gpd.I dont think the plastic cover on the front control panel is necessary at all. Its already hiding in a cabinet. Stokk does provide everything you need except a drill, 1/4" bit and phillips screw driver. You might also need a pair of kitchen shears to trim the tubing.The included thank you letter is a nice touch, talking about the company's start. Stokk cares about the environment and all the waste caused by water bottles. But looking at the filter cartridges they use, they are encased in some heavy duty plastic. Unlike others that I have used in the past, these do not seem to open allowing you to just remove the old filter and or RO membrane. (Confirmed by watching Stokk's filter replacement youtube video.). Which means excess waste in the landfill that will take decades to breakdown. I would like to see development in this area. Sure its super convenient but not green in the least and kinda makes me wonder if I bought the system.This company has US based support and is from Hong Kong. . Jin Fang Technology has 3 trademarks for Stokk that were filed in 2023. So despite being new to the scene their product is seriously well designed.Stokk S1 series filtration meets the following specifications and is certified by SGS, a global certifiacation company. Certs can be found on the Stokk support website.NSF/ANSI 42Filters are certified to reduce aesthetic impurities such as chlorine and taste/odor. These can be point-of-use (under the sink, water pitcher, etc.) or point-of-entry (whole house) treatment systems.NSF/ANSI 58Reverse osmosis systems incorporate a process that uses reverse pressure to force water through a semi-permeable membrane. Most reverse osmosis systems incorporate one or more additional filters on either side of the membrane. These systems reduce contaminants that are regulated by Health Canada and EPA.For those of you who dont read the included manuals, you can extend your 1 yr warranty for a 2nd year by scanning the QR code found in the last page if the book.

I had to change the filters after 11 months. I don't drink that much water, and it's only me. When you get the new filters, there are no instructions on how to change the filter. All in all, it's a compact unit that works well except for the short filter life.

Why did you pick this product vs others?:Clean refreshing water anytime I want it. Easy to hook up and tastes great!

READ BEFORE YOU BUY!!! Installed the Stokk 600 (S 1 Pro) about 4 month ago. The system is lightly used every day. We started to notice a strange taste of the water. I made multiple tests and found very weird results. As many others already mentioned, you must waste over a min of water running before the TDS is acceptable. My city tap water is 150 TDS and filtered water starts with 90 TDS (red zone level), you need to waste a lot of water before you get acceptable 30 TDS. This goes against their claim that it wastes less water. After being off for 2-3 hours the TDS will initially read 90s again. This is very inconvenient when you only want a quick glass of water. You must know about this before buying this wasteful system.

Loving this RO system—installation was pretty smooth, and the water tastes so much better now. It’s great knowing the filters are doing their job, and the tank fills up quickly. Maintenance seems easy too. Overall, it’s been a solid upgrade for our home and totally worth the investment.

Works fantastic after a few years, just need to replace the filters on occasion. Solid for a cheaper RO filter. I had someone else install it