Bests & Worsts Reviews from Amazon

Previous Headline : Does not produce 2:1 RO to waste ratio (unless you run it forever) ******UPDATE*****: I've had the Waterdrop GDP 600 for over a year now and I feel the need to update my previous 2 star review. Yes, you will waste more water if you primarily use the system to fill a small drinking glass. When you turn off the faucet a small amount of water flushes the system and flows through the waste tube. However, you can still achieve a very good RO to waste ratio if you simply fill a larger water containers. Since our purchase my family has primarily filled either our1 liter water bottles, or a pitcher of water we keep in the fridge. Problem solved! Delicious RO water for all with very respectable RO to waste ratio. Like any good tool, it works best when used correctly. If you are concerned about how much water you waste (looking at you CA), then be smart about how you use it. Customer service has continued to be great, replacing the first filter was a snap, and we have had zero problems! I don't think I could have found a better system to fit in the space I had available. Previous review: My review would be a lot better if I didn't feel like I was a victim of false advertising. Sure...they will find a way to tell you that it produces a 2:1 waste ratio, but it's kinda like how my car can go from 0-60 mph in 2.73 seconds if I drop it out of an airplane. For all practical purposes, this system wastes a lot more water than advertised. Before I get into it, let us start with the good: Super easy to install (after you cut a hole in your countertop). Water tastes good. Not too noisy. Compact compared to some of the other systems, which is great if you have limited space. Oh...and customer service was pleasant and helpful. Now the rest: I decided to collect the wastewater in a 3-gallon jug for watering plants. After a couple of weeks, it seemed like I was having to empty the jug far too often, so I decided to check how much waste one cup of RO water produced. I attached a video showing what I found. One cup of RO produced 1.5 cups of waste, for a 2:3 ratio! Nowhere near the advertised 2:1! So, I made the video and contacted customer support thinking there was something wrong with my system. Nope.... The advertised 2:1 ratio is calculated (as far as I can tell) when the system is running at its optimal rate and the initial waste and end waste are not considered a factor (they told me not to measure the water that continued to pour out of the waste tube after the faucet was off when calculating my ratios). Seems odd to not count water spilling out of the waste tube as waste, but that's what they wanted. I guess the initial and end waste would be inconsequential if you were running the system continuously for extended periods of time, but not for someone simply looking for a glass of water. So...if you are planning on using the RO system to fill a drinking glass, count on wasting more water than you get to drink. The efficiency does improve the longer you have the faucet on. 1 cup RO: 2:3 ratio 2 cups RO: 1:1 ratio 4 cups RO: 4:3 ratio I don't know how many cups until you get to the advertised 2:1 ratio, but it is well out of the average use range. In all fairness, it is completely possible that all undersink RO companies calculate their ratios the same way. I haven't researched yet and will update the review when/if I get around to it.