---
product_id: 626976765
title: "iSpring RO400 Reverse Osmosis System, Tankless Water Filtration System, 400 GPD Fast Flow Under Sink RO System with Brushed Nickel Faucet, 2.5:1 Pure to Drain Ratio, TDS Reduction, White"
brand: "ispring"
price: "$1035.11"
currency: USD
in_stock: true
reviews_count: 8
category: "I Spring"
url: https://www.desertcart.us/products/626976765-ispring-ro400-reverse-osmosis-system-tankless-water-filtration-system-400
store_origin: US
region: United States of America
---

# 400 GPD ultra-fast flow Built-in filter life indicator 2.5:1 pure to drain ratio, 400% water efficient iSpring RO400 Reverse Osmosis System, Tankless Water Filtration System, 400 GPD Fast Flow Under Sink RO System with Brushed Nickel Faucet, 2.5:1 Pure to Drain Ratio, TDS Reduction, White

**Brand:** ispring
**Price:** $1035.11
**Availability:** ✅ In Stock

## Summary

> 💧 Pure water, zero compromises — stay refreshed, stay ahead.

## Quick Answers

- **What is this?** iSpring RO400 Reverse Osmosis System, Tankless Water Filtration System, 400 GPD Fast Flow Under Sink RO System with Brushed Nickel Faucet, 2.5:1 Pure to Drain Ratio, TDS Reduction, White by ispring
- **How much does it cost?** $1035.11 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/626976765-ispring-ro400-reverse-osmosis-system-tankless-water-filtration-system-400)

## 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

- • **Contaminant Crusher:** Removes 99% of over 1,000 harmful impurities including lead, fluoride, chlorine, and arsenic.
- • **Eco-Smart Efficiency:** Uses a 2.5:1 pure to drain ratio, saving up to 70% more water than traditional RO systems.
- • **Filter Life at a Glance:** Smart LED indicator alerts you before filter replacement, ensuring peak water purity without guesswork.
- • **Lightning-Fast Hydration:** Delivers up to 400 gallons per day, filling your glass in under 9 seconds.
- • **Space-Savvy Tankless Design:** Sleek under-sink installation frees up 70% more cabinet space for your essentials.

## Overview

The iSpring RO400 is a cutting-edge tankless reverse osmosis system delivering up to 400 gallons of purified water daily with a highly efficient 2.5:1 pure to drain ratio. Its advanced 4-in-1 filtration removes 99% of over 1,000 contaminants, including heavy metals and chemicals, while a built-in filter life indicator ensures hassle-free maintenance. Designed for fast flow and space-saving under-sink installation, it’s the smart choice for health-conscious professionals who demand clean water without waste.

## Description

iSpring RO400 Reverse Osmosis System, Tankless Water Filtration System, 400 GPD Fast Flow Under Sink RO System with Brushed Nickel Faucet, 2.5:1 Pure to Drain Ratio, TDS Reduction, White : desertcart.co.uk: DIY & Tools

Review: Great product. - Easy to install, great quality water.
Review: You won't find the PCT filter replacement - Good product but when it comes to replace the filter you wouldn't find it so think twice before purchase.

## Features

- [400 GPD & 2.5:1 Pure Wastewater Ratio]: The iSpring Under Sink Reverse Osmosis Water Filter System RO400 has a 2.5:1 pure wastewater ratio, which is up to 400% more water efficient than traditional under sink RO systems. Tankless reverse osmosis systems flow up to 0.4 GPM with minimal waste, and RO water filtration systems take less than 8.5 seconds to fill a glass of water
- [Highest Impurity Removal Rate]: The under-sink RO water filter system converts tap water into clean RO drinking water. The 4-in-1 PCT filter removes up to 99% of more than 1,000 harmful contaminants such as chlorine, fluoride, lead (up to 98%), arsenic, asbestos, calcium, sodium, sediment, sand, odours, etc. The TDS removal rate is up to 99%
- [Built-in Filter Life Indicator]: The Filter Life Indicator stays blue and starts flashing red when less than 5% of the corresponding filter life is left, and changes to red when the filter needs to be replaced. It is recommended that filters be replaced on a scheduled basis to maintain high performance filtration. You can find replacement filters by searching for FPCT400 and MRO400EU.
- [Easy to Install and Maintain]: All-in-one water line technology makes the reverse osmosis water filtration system easy to install on your own. It can be installed under a sink and the tankless design saves up to 70% of space.
- [Clean Mode]: Press Press the "Flush" button it will flush the reverse osmosis membrane for 30 seconds to extend its life.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D35FH65Q |
| Best Sellers Rank | 134,714 in DIY & Tools ( See Top 100 in DIY & Tools ) 79 in Under-Sink Filters |
| Brand | iSpring |
| Capacity | 400 G/day |
| Container Type | Glass |
| Country Of Origin | China |
| Customer Reviews | 4.1 4.1 out of 5 stars (13) |
| Included Components | reverse osmosis system |
| Installation Type | Under Sink |
| Item Dimensions L x W x H | 15L x 20W x 64H centimetres |
| Manufacturer | iSpring |
| Material Type | Glass |
| Maximum Flow Rate | 0.4 Gallons Per Minute |
| Model Name | FPCT400 |
| Model Number | RO400 |
| Other Special Features of the Product | Tankless |
| Power Source | Corded Electric |
| Purification Method | Reverse Osmosis, Sand |
| UPC | 810004175327 |

## Product Details

- **Brand:** iSpring
- **Capacity:** 400 G/day
- **Included components:** reverse osmosis system
- **Installation type:** Under Sink
- **Material:** Glass
- **Package information:** Glass
- **Power source:** Corded Electric
- **Product dimensions:** 15L x 20W x 64H centimetres
- **Purification method:** Reverse Osmosis, Sand
- **Special feature:** Tankless

## Images

![iSpring RO400 Reverse Osmosis System, Tankless Water Filtration System, 400 GPD Fast Flow Under Sink RO System with Brushed Nickel Faucet, 2.5:1 Pure to Drain Ratio, TDS Reduction, White - Image 1](https://m.media-amazon.com/images/I/61EI6CTPWcL.jpg)

## Available Options

This product comes in different **Model** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product.
*by K***R on 2 August 2025*

Easy to install, great quality water.

### ⭐⭐ You won't find the PCT filter replacement
*by R***T on 12 April 2026*

Good product but when it comes to replace the filter you wouldn't find it so think twice before purchase.

### ⭐⭐⭐⭐⭐ Very good water filter , great service
*by J***K on 9 February 2025*

I would like to highly recommend this water filter system , very easy installation , very efficient and fast customer service ( Francis always to support and help ) very fast response to messages

## Frequently Bought Together

- iSpring RO400 Reverse Osmosis System, Tankless Water Filtration System, 400 GPD Fast Flow Under Sink RO System with Brushed Nickel Faucet, 2.5:1 Pure to Drain Ratio, TDS Reduction, White
- iSpring FA15 10-inch Inline Quick Connect 3-Layer Alkaline Replacement Water Filter Cartridge with Mineral Balls, Calcite, and Corosex for Reverse Osmosis RO System, White

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-04-25*