GREATWELL ROG400 Tankless Reverse Osmosis Water Filtration System with 400 GPD RO Filter 1.5:1 Pure to Drain Ratio and Drinking Water Faucet
$598.99
About this item
- ROG400 is a tankless reverse osmosis system. The vertical filter placement design saves more than 30% of space under the sink compares to a horizontal design. A leak-free integrated water route and filter change indicator.
- The PAC filter is a combination of two sediment filters and a carbon filter that removes sand, rust, chlorine, odor, and smell. The RO membrane removes up to 99% of over 1,000 contaminants, including PFAS, lead, fluoride, arsenic, asbestos, and more for up to 3 years. The AC or the active carbon filter made from coconut shell further polishes water removing odor and bad taste.
- With a built-in water pump and GE reverse osmosis membrane rated at 400 GPD, the water flow rate from ROG400 is at 0. 3-0. 4 gal./min., with a pure to wastewater ratio (up to 1.5 : 1).
- DIY installation and future filter replacement. The unit can be connected to the ice maker/refrigerator. It includes an artisan-style stainless steel drinking water faucet.
- At GreatWell, we only use quality components tested by an independent 3rd party against NSF/ANSI standards. Lifetime technical support provided by our dedicated support team based in Atlanta, GA.
Frequently Bought Together

GREATWELL Tankless Reverse Osmosis Water Filtration System with 400 GPD RO Filter 1.5:1 Pure to Drain Ratio and Drinking Water Faucet
$598.99
- Availability: In Stock
- Model: ROG400
- Manufacturer: iSpring
Write Review
kip eaton | 
2019-07-13
This system is amazing!! Reverse osmosis is one of the few water filtration systems that removes fluoride. It also removes lead, chlorine, arsenic, and other awful things found in your water. I took a look at the disposed water (stuff left over from the filter) and it smelled so strongly of chlorine and was frothy and disgusting. I am so glad I have this system now and am confident Im giving my family fresh, clean water. It comes with a little faucet that you have to connect to the filter. We have the faucet right next to our tap water in our sink. My husband also hooked the filter up to our refrigerator water so we have filtered ice cubes in our ice cube maker and filtered water from the water spout connected to our fridge. We put the entire system down in the basement connected up to the kitchen to the faucet that came with it so it doesnt take up any room unter the sink. The one downside to reverse osmosis is that it is SO effective at cleaning your water that it removes a lot of beneficial minerals as well. This system comes with a re-mineralizing filter that adds back in desirable minerals such as calcium. We did a lot of research on various reverse osmosis systems, and this is the one we decided on due to the price of the system, price/life span of replacement filters, and the re-mineralizing filter. All in all, we decided this was the best system we found on Amazon with all that in mind. It was an amazing investment. My husband hooked this all up on his own. He is pretty handy, though, so Im not sure if its doable for everyone. I know I wouldnt know where to begin, but it seemed fairly easy for him, taking no more than an hour to have it all installed including the faucet. We even use this water for boiling noodles etc. I am really glad we got this and would recommend it to anybody looking for a reverse osmosis system. My 4 year old tasted the water and said, "This water is DELICIOUS!" Five stars hands down.

2019-07-13
This system is amazing!! Reverse osmosis is one of the few water filtration systems that removes fluoride. It also removes lead, chlorine, arsenic, and other awful things found in your water. I took a look at the disposed water (stuff left over from the filter) and it smelled so strongly of chlorine and was frothy and disgusting. I am so glad I have this system now and am confident Im giving my family fresh, clean water. It comes with a little faucet that you have to connect to the filter. We have the faucet right next to our tap water in our sink. My husband also hooked the filter up to our refrigerator water so we have filtered ice cubes in our ice cube maker and filtered water from the water spout connected to our fridge. We put the entire system down in the basement connected up to the kitchen to the faucet that came with it so it doesnt take up any room unter the sink. The one downside to reverse osmosis is that it is SO effective at cleaning your water that it removes a lot of beneficial minerals as well. This system comes with a re-mineralizing filter that adds back in desirable minerals such as calcium. We did a lot of research on various reverse osmosis systems, and this is the one we decided on due to the price of the system, price/life span of replacement filters, and the re-mineralizing filter. All in all, we decided this was the best system we found on Amazon with all that in mind. It was an amazing investment. My husband hooked this all up on his own. He is pretty handy, though, so Im not sure if its doable for everyone. I know I wouldnt know where to begin, but it seemed fairly easy for him, taking no more than an hour to have it all installed including the faucet. We even use this water for boiling noodles etc. I am really glad we got this and would recommend it to anybody looking for a reverse osmosis system. My 4 year old tasted the water and said, "This water is DELICIOUS!" Five stars hands down.
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ROG400 Manual