--- product_id: 72205263 title: "GREATWELL 400 GPD Tankless Reverse Osmosis (RO) Water Filtration System with 1.5:1 Pure to Drain Ratio and Drinking Water Faucet" brand: "ispring" price: "KD 22.17" currency: KWD in_stock: false reviews_count: 8 url: https://www.desertcart.com.kw/products/72205263-greatwell-400-gpd-tankless-reverse-osmosis-ro-water-filtration-system store_origin: KW region: Kuwait --- # 400 GPD high-capacity flow 30% space-saving vertical design 1.5:1 pure to drain efficiency GREATWELL 400 GPD Tankless Reverse Osmosis (RO) Water Filtration System with 1.5:1 Pure to Drain Ratio and Drinking Water Faucet **Brand:** ispring **Price:** KD 22.17 **Availability:** ❌ Out of Stock ## Summary > 💧 Elevate your hydration game with pure, powerful, and space-smart filtration! ## Quick Answers - **What is this?** GREATWELL 400 GPD Tankless Reverse Osmosis (RO) Water Filtration System with 1.5:1 Pure to Drain Ratio and Drinking Water Faucet by ispring - **How much does it cost?** KD 22.17 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/products/72205263-greatwell-400-gpd-tankless-reverse-osmosis-ro-water-filtration-system) ## Best For - ispring enthusiasts ## Why This Product - Trusted ispring brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Effortless Maintenance:** Integrated leak-free water path and filter change indicator make upkeep a breeze—DIY friendly. - • **Eco-Friendly Efficiency:** 1.5:1 pure to drain ratio reduces waste, saving water and lowering your footprint. - • **Premium Quality & Support:** NSF-certified components with lifetime technical support ensure peace of mind and lasting performance. - • **Ultra-Pure Water on Demand:** Delivers up to 400 gallons per day with a sleek tankless setup—never run out of fresh water. - • **Space-Savvy Vertical Design:** Maximize your under-sink real estate with 30% more room than traditional systems. ## Overview The GREATWELL 400 GPD Tankless Reverse Osmosis System offers a compact vertical design that saves 30% under-sink space, a high-capacity 400 gallons per day flow rate, and an efficient 1.5:1 pure to drain ratio. Featuring NSF-certified filters that remove over 1,000 contaminants, an integrated leak-free water route, and a stylish stainless steel faucet, it combines premium water quality with easy DIY installation and maintenance. Ideal for professionals seeking reliable, eco-conscious hydration solutions with lifetime support. ## Description GREATWELL 400 GPD Tankless Reverse Osmosis (RO) Water Filtration System with 1.5:1 Pure to Drain Ratio and Drinking Water Faucet - desertcart.com Review: Love the product and their services - I love greatwell rog400 undersink water filter system, it is compact, easy to install. I used reverse osmosis water to boil tea and taste good. The most importantly they are very responsive to customer questions and provided excellent customer support. When RO filter not available on desertcart temporarily they provided me alternative link to order online. I bought my unit in December 2018, faucet started to have dripping problem a few months ago, Nick responded to my request for help quickly, he went above and beyond to ensure right replacement faucet was sent and for free. Thank you Review: This is the filter I was looking for - Installation We got the water filter today and I've installed it myself with the help of my dad. We are not experts in plumbing so consider us as layman here. It was not that hard to install, but you have to plan properly. The manual should contains more details. The tubes once go into filter won't come back out, so you need to properly plan, given little space under the sink. Pros I live in Austin, TX where the tap water is around 180 ppm measured in TDS meter. After installing this, it came down to 12 ppm. Water taste great. No difference from the water I got from commercial water delivery service. Waste water (drainage) was not bad at all. I kept waste water line drained into a bucket for few days and the waste water amount was less than the filtered water amount (this was a concern I had because this is a RO filter). This is great for an RO filter. There is a pump inside and it's very quiet. You need to electric power, so make sure you got an outlet there. From my calculations this should be economical for me than using a water delivery service. From the look of it, the components are properly built. Cons Nothing much. The instructions should be more detailed. Makes sure you watch the YouTube video from them. Price is bit high, but I'm happy as long as this works as they say. I'm very happy so far. Nothing much ## Features - Vertical filter placement design saves around 30% of space under the sink compares to a horizontal design; a leak-free integrated water route and filter change indicator make this water filtration system a breeze to install and maintain - The PAC filter is a combination of sediment filters and a carbon filter that removes sand, rust, chlorine, odor, and smell; the Active Carbon polishes water to ensure water quality and taste - Built-in water pump and GE ro 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); the RO membrane removes up to 99% of over 1,000 contaminants for up to 3 years - Easy to perform 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 customer service team ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07F72FWJM | | Best Sellers Rank | #2,591,216 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2,855 in Under-Sink & Countertop Filtration | | Brand Name | iSpring | | Capacity | 400 Gallons | | Container Type | Bottle | | Customer Reviews | 4.1 4.1 out of 5 stars (62) | | Global Trade Identification Number | 00662425095742 | | Included Components | System with filters pre-installed, Faucet, Feed water adapter, tubings. | | Installation Type | Under Sink | | Item Type Name | Tankless Reverse Osmosis (RO) Water Filtration System | | Item Weight | 19 Pounds | | Manufacturer | iSpring Water Systems | | Material Type | Stainless Steel | | Maximum Flow Rate | 0.4 Gallons Per Minute | | Model Name | ROG400 | | Model Number | ROG400 | | Other Special Features of the Product | Chlorine, NSF certified, Tankless | | Purification Method | Reverse Osmosis | | UPC | 662425095742 | | Warranty Description | 1-year limited manufacturer warranty | ## Product Details - **Brand:** iSpring - **Capacity:** 400 Gallons - **Included Components:** System with filters pre-installed, Faucet, Feed water adapter, tubings. - **Installation Type:** Under Sink - **Item Weight:** 19 Pounds - **Material:** Stainless Steel - **Model Name:** ROG400 - **Package Information:** Bottle - **Purification Method:** Reverse Osmosis - **Special Feature:** Chlorine, NSF certified, Tankless ## Images ![GREATWELL 400 GPD Tankless Reverse Osmosis (RO) Water Filtration System with 1.5:1 Pure to Drain Ratio and Drinking Water Faucet - Image 1](https://m.media-amazon.com/images/I/51VBbYNCPTL.jpg) ![GREATWELL 400 GPD Tankless Reverse Osmosis (RO) Water Filtration System with 1.5:1 Pure to Drain Ratio and Drinking Water Faucet - Image 2](https://m.media-amazon.com/images/I/71jwAV6Hl8L.jpg) ![GREATWELL 400 GPD Tankless Reverse Osmosis (RO) Water Filtration System with 1.5:1 Pure to Drain Ratio and Drinking Water Faucet - Image 3](https://m.media-amazon.com/images/I/71NWJyDMTWL.jpg) ![GREATWELL 400 GPD Tankless Reverse Osmosis (RO) Water Filtration System with 1.5:1 Pure to Drain Ratio and Drinking Water Faucet - Image 4](https://m.media-amazon.com/images/I/61QwYYS+2zL.jpg) ![GREATWELL 400 GPD Tankless Reverse Osmosis (RO) Water Filtration System with 1.5:1 Pure to Drain Ratio and Drinking Water Faucet - Image 5](https://m.media-amazon.com/images/I/71dMhRS3nFL.jpg) ## Questions & Answers **Q: Why does the video show the installation of the drain line between the wall and the p-trap where sewer gases could back flow into unit?** A: Hello. The system comes with a back wash system included. Installing the Drain Saddle 3.1 Choose a spot on the drain pipe that is convenient for installing the drain saddle and tubing. A horizontal pipe is recommended to minimize the dripping sound. 3.2 Drill a 1 /4 inch hole in the drain pipe, and paste the black sticky pad around the hole. 3.3 Cut the WHITE tubing end to make a 45 degree angle. Slip the plastic nut and front plate on the tubing. Insert the tubing into the 1 / 4 inch hole in the drain pipe, install the back plate, and tighten the two screws with hex nuts while the tubing remains in the hole. Insert Lock Clip. Pull the tubing lightly to make sure it is secure. 3.4 Tighten the nut on the Drain Saddle by hand. Pull the tubing lightly to make sure it is secure. **Q: What should I expect the water ph balance to be once connected?** A: Hi Jeremiah, The ph value is dependent on the ph value from the source water and also is dependent on the mineral content in the source water **Q: Wii it work with well water** A: Yes but you may prefer a system with booster pump to maintain pressure necessary for reverse osmosis process. We also have pump systems equipped with UV lights for well water. **Q: Did it provide hot water?** A: Hi, Unfortunately, this is just a water filter and does not include a water heater. For more details, please contact us at (678)900-4702. Regards, PureDrop ## Customer Reviews ### ⭐⭐⭐⭐⭐ Love the product and their services *by A***R on November 5, 2025* I love greatwell rog400 undersink water filter system, it is compact, easy to install. I used reverse osmosis water to boil tea and taste good. The most importantly they are very responsive to customer questions and provided excellent customer support. When RO filter not available on Amazon temporarily they provided me alternative link to order online. I bought my unit in December 2018, faucet started to have dripping problem a few months ago, Nick responded to my request for help quickly, he went above and beyond to ensure right replacement faucet was sent and for free. Thank you ### ⭐⭐⭐⭐⭐ This is the filter I was looking for *by L***L on September 21, 2019* Installation We got the water filter today and I've installed it myself with the help of my dad. We are not experts in plumbing so consider us as layman here. It was not that hard to install, but you have to plan properly. The manual should contains more details. The tubes once go into filter won't come back out, so you need to properly plan, given little space under the sink. Pros I live in Austin, TX where the tap water is around 180 ppm measured in TDS meter. After installing this, it came down to 12 ppm. Water taste great. No difference from the water I got from commercial water delivery service. Waste water (drainage) was not bad at all. I kept waste water line drained into a bucket for few days and the waste water amount was less than the filtered water amount (this was a concern I had because this is a RO filter). This is great for an RO filter. There is a pump inside and it's very quiet. You need to electric power, so make sure you got an outlet there. From my calculations this should be economical for me than using a water delivery service. From the look of it, the components are properly built. Cons Nothing much. The instructions should be more detailed. Makes sure you watch the YouTube video from them. Price is bit high, but I'm happy as long as this works as they say. I'm very happy so far. Nothing much ### ⭐ Cannot get replacement filters *by D***B on December 15, 2020* Product works well but what good does it do if you are unable to find replacement filters . I just purchased a different brand with easily available filters. Now I have $ 800.00 in RO units. Covid means buy from the Americas Update supplier said filters in first part Jan, now is saying they don't know when they will be available, This unit should not be for sale unless the replacement filters are available. Waste of money and time DO NOT BUY --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.kw/products/72205263-greatwell-400-gpd-tankless-reverse-osmosis-ro-water-filtration-system](https://www.desertcart.com.kw/products/72205263-greatwell-400-gpd-tankless-reverse-osmosis-ro-water-filtration-system) --- *Product available on Desertcart Kuwait* *Store origin: KW* *Last updated: 2026-05-16*