Waterdrop C1SL Mineral Reverse Osmosis System, 7-Stage Countertop Reverse Osmosis Water Filter

I have to give a big shoutout to the Waterdrop team. The first system that I bought, it stopped working after 6 months. I was extremely disappointed and reached out to the Waterdrop team because 6mos for an osmosis system seemed unacceptable. Kimberly helped me out the entire time; she was able to order a new one for me without any charge! Since then, the machine has been working beautifully. It has been almost a year. For the price, you're getting good quality. It's easy to use, water tastes good, and the filter is still at 60% after about 5-6 months of use. Kimberly checked in again via email, months later to make sure the machine was working. I truly appreciate the amazing customer service and how Waterdrop stands by their products. Thank you! Highly recommended.

I bought the Waterdrop countertop system about 2.5 years ago since installing an under-sink unit wasn’t possible in my home. Overall, I was very satisfied, but at one point the water tank started leaking after 1.5 years. When I contacted customer service, they quickly replaced it with a new one without any cost. Recently, the old unit stopped working unfortunately, so I decided to look for a replacement. The new upgraded model is even better—sleeker design, improved features, and it works perfectly. Thanks to Olivia from customer service, I was able to take advantage of a great Labor Day Sale deal. She was very helpful and supportive throughout the process. I also love that the new system now uses just one filter instead of two, and the filter life is longer, which makes maintenance easier and more affordable. The water also tastes even better now, which is a great improvement. Highly recommend both the product and the outstanding customer service!

I bought this Waterdrop CoreRO in Jan 2026. Unfortunately some sensors were not working well and it was impossible to install. I wrote to the seller Representative Ms Becky and after checking out with their technician they decided to replace the unit. Within few days I received the new Water Filter RO. Ms Becky was always in touch with me to make sure that this time all is fine. I am happy with the Waterdrop CoreRO and recommend it highly. On top of that I want to thank the Waterdrop company especially Ms Becky for their great customer service and continuous support. Ms Becky with her team is the Super Customer Service Rep 🏆

Makes great tasting water. However, it must be plugged in 24/7/365. The kitchen breaker trips in my rental when more than one thing is turned on. I like to eat my food cooked, so this cannot be plugged in 24/7/365 in the kitchen. It immediately thinks it needs flushed again, every time it loses power. The unneeded extra flushes waste a lot of water. I'm in the desert where recycled, chemically treated water tastes bad and the reservoirs are otfen low. Had to move it to my bedroom for it to stay on 24/7/365 to avoid all the extra flushes. So, now walking back and forth from bedroom to kitchen to fill the water tank. The water it makes tastes great. It takes several minutes to fill a pitcher, but it is worth it. Four stars for not being able to unplug it.

Received the waterdrop RO in a very timely manner. Instructions very easy to follow to set the filter up for first use. The water quality is fantastic. My wife loves how easy it is to use. The functionality is very nice. Once you fill the tank with the unfiltered water it does not take long for the RO to fill the container with the good RO water. So filters pretty fast and it does the automatically. We chose this counter top for the value and the size would fit under our cabinet. Plus we want the grate taste of alkalinity water. Unfortunately this product was not ship with the alkalinity filter. I contacted Waterdrop through email. I ask them if this filter was the correct filter. The Waterdrop representative from the customer service, told me that this was not the alkalinity filter that should had shipped with the product. The customer service supper nice and waterdrop has already sent me a new correct filter. What an awesome company. This is a fantastic company and a great countertop RO system. 12/30/2025 update About 6 months my water tank started to leak when filling the tank. I emailed WaterDrop my problem with the tank. They gave me instructions how to make sure I was cleaning the tank Correctly. This did not fix the leak. I email back WaterDrop said they could send me a new filter machine to replace the one I have. I said I believe it is just the tank. They sent me a tank to see if that was it but also willing to send me a complete replacement if it was not the problem. It did turn out to be the tank. But through this whole process WaterDrope was so good. This is why in my opinion there the best in customer service. This company will go far and beyond what other companies will to make sure your 100% satisfied.

The description clearly states that this comes with a built in TDS monitor, and the pictures show this as well. This is not there. Instead, it shows a filter status of 100%. Also, after working through the initial setup process, and even flushing the water a second time, just for good measure, there’s a very strong metal flavor to the water. I’m very used to RO water and it’s the only water I drink. Maybe if I didn’t have this background, I wouldn’t notice this, so I asked my wife how it tastes to her. Same reaction that it tastes like metal, though she’s from the Philippines and only drinks purified water there. Love the functionality of it, but without the TDS meter and with it tasting very bad, I’m sending this back.

I purchased the Waterdrop CoreRO pH+ and the entire thing worked as expected, everything seemed to be going well all the way until I tested water quality. The CoreRO seems to meet all the water standards included in the test I purchased with the only exception that instead of producing 7.5 pH it is consistently testing at 6.0 to 6.5 pH every single time. I've reset the filter and went through the entire setup again, hoping that maybe clearing the filter a little all over again would have different results but I'm back to square 1 with the machine landing back at a 6 to 6.5 pH level. Everything else checks every single box from convenience to even the taste of water being great, with the one exception that pH is too low.

Worked great for about a month. Started having E04 errors. Contacted customer service and we did the troubleshooting and all that, didn’t really fix anything. Now in month 5 of owning it, it throws constant E04 errors after being plugged in for only 15 minutes. Waste of money and customer service won’t do anything about it. Won’t even last the 1 year they claim it should. Update: Was able to get it replaced under warranty. Becky did a fantastic job on exchanging the product with better alternatives! She handled everything very well, with clear and consistent communication. I’m very happy with Waterdrop’s customer service team.

Realmente vale lo que cuesta. El agua es insabora, inodoro, y el filtro usándolo diario para una familia de tres nos duró más de un año

The filter gets stuck in the flushing step. The display shows 51% and does not advance to the next step. It makes a lot of noise and does not reach 100% to drink water normally.