--- product_id: 81174370 title: "MRO400 High Capacity 400GPD RO Membrane Replacement 400 GPD Tankless Reverse Osmosis (RO) Water Filtration System - Stage 2" brand: "greatwell" price: "€ 427.95" currency: EUR in_stock: true reviews_count: 2 category: "Greatwell" url: https://www.desertcart.gr/products/81174370-mro400-high-capacity-400gpd-ro-membrane-replacement-400-gpd-tankless store_origin: GR region: Greece --- # 400 GPD ultra-fast filtration 1.5:1 pure-to-drain efficiency 99% contaminant removal MRO400 High Capacity 400GPD RO Membrane Replacement 400 GPD Tankless Reverse Osmosis (RO) Water Filtration System - Stage 2 **Brand:** greatwell **Price:** € 427.95 **Availability:** ✅ In Stock ## Summary > 💧 Elevate your water game with pro-grade purity and efficiency! ## Quick Answers - **What is this?** MRO400 High Capacity 400GPD RO Membrane Replacement 400 GPD Tankless Reverse Osmosis (RO) Water Filtration System - Stage 2 by greatwell - **How much does it cost?** € 427.95 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/81174370-mro400-high-capacity-400gpd-ro-membrane-replacement-400-gpd-tankless) ## Best For - greatwell enthusiasts ## Why This Product - Trusted greatwell brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Snap-On Convenience:** Effortless filter swaps keep your system running smoothly—no tools, no fuss, just pure water. - • **Long-Lasting Durability:** Engineered to perform flawlessly for up to 3 years, reducing replacement frequency and hassle. - • **Ultra-Fast 400 GPD Flow:** Delivers up to 40 oz of purified water per minute—never wait for clean hydration again. - • **Advanced Contaminant Defense:** Eliminates 99% of 1,000+ harmful substances including lead, fluoride, and arsenic for peace of mind. - • **Optimized 1.5:1 Efficiency Ratio:** Maximizes water use with industry-leading pure-to-drain balance, saving resources and money. ## Overview The GREATWELL MRO400 is a high-capacity 400 GPD reverse osmosis membrane replacement designed for the ROG400 system. Featuring a superior 1.5:1 pure-to-drain ratio, it delivers rapid filtration while removing up to 99% of over 1,000 contaminants including heavy metals and chemicals. Built for longevity, this GE-made membrane lasts up to 3 years and offers snap-on installation for seamless maintenance. ## Description The RO membrane of ROG400 is made by GE and rated at 400GPD, which provides up to 40 oz of purified water within a minute, along with a high efficiency 1.5:1 pure-to-drain ratio. It’s a long-living workhorse that removes up to 99% of over 1,000 contaminants including lead, fluoride, arsenic, hormones, asbestos and more for up to 3 years. Review: The best filters. Best customer service. - Wonderful customer service. Great product. Review: Filter Life - I have owned this unit for four years now. The smaller filters last a year, the RO Filter lasted 2 years. Heavy use, water for coffee and Tea, cooking, Dogs and Chickens! ## Features - Fits Greatwell ROG400 RO system. - Package includes one 400 GPD RO membrane that works efficiently with a 1.5:1 pure to drain ratio. - It removes up to 99% of over 1,000 contaminants including lead, fluoride, arsenic, hormones, asbestos and more, and lasts for up to 3 years. - Snap-on RO membrane provides easy filter replacement. - It is recommended to be replaced every 2 to 3 years depending on the water quality and usage. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07H8XT9GF | | Best Sellers Rank | #342,215 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2,213 in Replacement Under-Sink Water Filters | | Brand | GREATWELL | | Brand Name | GREATWELL | | Customer Reviews | 4.9 out of 5 stars 17 Reviews | | Manufacturer Part Number | MRO400 | | Material | ro | | Material Type | ro | | Model Number | MRO400 | | UPC | 662425096916 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** GREATWELL - **Material:** ro - **UPC:** 662425096916 - **Unit Count:** 1.0 Count ## Images ![MRO400 High Capacity 400GPD RO Membrane Replacement 400 GPD Tankless Reverse Osmosis (RO) Water Filtration System - Stage 2 - Image 1](https://m.media-amazon.com/images/I/41vF1u6J25L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ The best filters. Best customer service. *by L***. on March 27, 2024* Wonderful customer service. Great product. ### ⭐⭐⭐⭐ Filter Life *by Z***K on February 20, 2025* I have owned this unit for four years now. The smaller filters last a year, the RO Filter lasted 2 years. Heavy use, water for coffee and Tea, cooking, Dogs and Chickens! --- ## 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.gr/products/81174370-mro400-high-capacity-400gpd-ro-membrane-replacement-400-gpd-tankless](https://www.desertcart.gr/products/81174370-mro400-high-capacity-400gpd-ro-membrane-replacement-400-gpd-tankless) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-07-25*