---
product_id: 90323977
title: "RO-101S Reverse Osmosis UnderSink Water Filtration System l 4 Stage Filter"
brand: "aquaphor"
price: "¥145859"
currency: JPY
in_stock: true
reviews_count: 13
category: "Aquaphor"
url: https://www.desertcart.jp/products/90323977-ro-101s-reverse-osmosis-undersink-water-filtration-system-l-4
store_origin: JP
region: Japan
---

# 99% contaminant removal 50% smaller footprint 4-stage filtration system RO-101S Reverse Osmosis UnderSink Water Filtration System l 4 Stage Filter

**Brand:** aquaphor
**Price:** ¥145859
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your hydration game with pure, mineral-rich water—because your health deserves the best.

## Quick Answers

- **What is this?** RO-101S Reverse Osmosis UnderSink Water Filtration System l 4 Stage Filter by aquaphor
- **How much does it cost?** ¥145859 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/90323977-ro-101s-reverse-osmosis-undersink-water-filtration-system-l-4)

## Best For

- aquaphor enthusiasts

## Why This Product

- Trusted aquaphor brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Appliance Guardian:** Eliminates water hardness to extend the life of your coffee machines, kettles, and irons.
- • **Space-Savvy Design:** Takes up half the space of traditional RO systems—perfect for sleek, modern kitchens.
- • **Ultra-Pure Hydration:** Removes bacteria, viruses, heavy metals, PFAS, microplastics, and more for crystal-clear water.
- • **Eco-Friendly Efficiency:** Saves up to 9,000 liters of water annually—hydrate sustainably without compromise.
- • **Mineral-Rich Refreshment:** Re-mineralizes water for balanced taste, ideal for coffee, baby formula, and cooking.

## Overview

The AQUAPHOR RO-101S is a compact, 4-stage reverse osmosis under-sink water filtration system that removes up to 99% of contaminants while saving up to 9,000 liters of water annually. Featuring innovative AQUALEN microfibre pre-filters, a high-efficiency RO membrane, and a re-mineralization cartridge, it delivers great-tasting, nutrient-rich water. Its space-saving design fits neatly under your sink, supports low water pressure, and protects household appliances by removing hardness. Easy annual filter replacements and DIY-friendly installation make it a smart, sustainable choice for health-conscious professionals.

## Description

Enjoy clean, great-tasting tap water with this compact reverse osmosis system. It removes up to 99% of contaminants and saves up to 9,000 liters annually.

Review: Perfect - One of the best filters and for a good price. Easy to install, No leak
Review: Easy to fitting - Excellent thank you

## Features

- INNOVATIVE TECHNOLOGY: The innovative RO-101S water tank takes up half the space under the sink than a traditional Reverse Osmosis system, saving up to 9,000 litres of water per year - and even works in houses water pressure at low as 1.9 bar of Dynamic Pressure.
- WHATS IN THE BOX: The Aquaphor RO-101S system comes complete with a tap and 4 filters, 1 x K5 Pre-filter, 1x K2 treatment & filtration cartridge, 1 x R0-50S membrane cartridge and 1x K7M water conditioning and re-mineralisation cartridge. Replacement filters are available individually - or in convenient money saving multi-packs.
- HOW IT WORKS: The K5 & K2 prefiltration cartridges use AQUALEN microfibre technology to filter out coarse particles like sand or clay - and the RO50S membrane eliminates bacteria, viruses, heavy metals,PFAS, microplastics, pesticides, lead, limescale, and chlorine. Finally, the K7M water conditioning and re-mineralisation cartridge adds back essential nutrients.
- GREAT TASTING WATER WITH ESSENTIAL MINERALS RESTORED: Unlike basic RO systems that strip water flat, the RO-101S finishes with a K7M re-mineralisation stage — restoring the essential minerals for balanced, refreshing taste. Perfect for drinking straight, making baby formula, brewing coffee, or cooking.
- LONGER APPLIANCE LIFE: RO-101 completely removes hardness from water, giving a longer life for coffee machines, kettles, irons and steamers - and means your humidifier will no longer leave a white dust on furniture.
- SERVICE AND MAINTENANCE : AQUAPHOR recommend changing your cartridges once per year using the easy to do, click & turn cartridge replacement system. Replacement filters are available individually - or in convenient money saving multi-packs.
- INSTALLATION : AQUAPHOR recommend engaging a plumber for the installation process - however, the AQUAPHOR RO-101S can be installed by a home owner competent in DIY.
- REPLACEMENT CYCLE : AQUAPHOR recommend installing new filters every 12 months, and a new membrane every 24 months – however, if the taste of water output changes, please replace within this timeframe.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01N4N1NUD |
| Best Sellers Rank | 259,014 in DIY & Tools ( See Top 100 in DIY & Tools ) 171 in Under-Sink Filters |
| Brand | AQUAPHOR |
| Capacity | 5 litres |
| Container Type | Faucet |
| Country Of Origin | Estonia |
| Customer Reviews | 4.0 out of 5 stars 76 Reviews |
| Filter Life Cycle | 1 Years |
| Included Components | Under Sink System |
| Included components | Under Sink System |
| Installation Type | Under Sink |
| Item Dimensions L x W x H | 37L x 19W x 42H centimetres |
| Item Weight | 7.4 Kilograms |
| LowerTemperature Range | 5 Degrees Fahrenheit |
| Manufacture Year | 2019 |
| Manufacturer | AQUAPHOR |
| Manufacturer Part Number | 508761 |
| Material | Plastic |
| Material Type | Plastic |
| Maximum Flow Rate | 190 Litres Per Day |
| Model Name | RO-101S |
| Model Number | 101S |
| Number of Items | 1 |
| Other Special Features of the Product | Remineralization |
| Product dimensions | 37L x 19W x 42H centimetres |
| Purification Method | Reverse Osmosis |
| Special feature | Remineralization |
| Supported Water TDS Level Maximum (PPM) | 500 |
| Unit Count | 1.0 count |
| Upper Temperature Rating | 100 Degrees Celsius |

## Product Details

- **Brand:** AQUAPHOR
- **Capacity:** 5 litres
- **Included components:** Under Sink System
- **Installation type:** Under Sink
- **Material:** Plastic
- **Package information:** Faucet
- **Power source:** Corded Electric
- **Product dimensions:** 37L x 19W x 42H centimetres
- **Purification method:** Reverse Osmosis
- **Special feature:** Reverse Osmosis, Space-Saving Design, Remineralization

## Images

![RO-101S Reverse Osmosis UnderSink Water Filtration System l 4 Stage Filter - Image 1](https://m.media-amazon.com/images/I/61QTlWkKBPL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect
*by O***A on 20 July 2024*

One of the best filters and for a good price. Easy to install, No leak

### ⭐⭐⭐⭐⭐ Easy to fitting
*by M***7 on 4 May 2023*

Excellent thank you

### ⭐ No Light Indicator
*by N***V on 20 November 2025*

Received the RO system today Aquaphor RO-101s But as one of the other review stated, it does not contain the Lights on the side to to indicate that the cartridges needs replaced.

## Frequently Bought Together

- AQUAPHOR RO-101S Compact Reverse Osmosis Water Filter - Under Sink Filtration System
- AQUAPHOR Crystal Replacement Filter Cartridge Set : K2 - K3 - K7
- AQUAPHOR A5Mg Added Magnesium replacement water filter cartridges, fits all A5 filter jugs, 1 pack, 350l per filter

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**Shop now:** [https://www.desertcart.jp/products/90323977-ro-101s-reverse-osmosis-undersink-water-filtration-system-l-4](https://www.desertcart.jp/products/90323977-ro-101s-reverse-osmosis-undersink-water-filtration-system-l-4)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-08-31*