This guide focuses on the AQUAPHOR RO-101S reverse osmosis filter system, a compact and efficient solution for home water purification. It is intended for homeowners seeking to improve their drinking water quality by removing contaminants. The products collectively support the installation and ongoing maintenance of the RO-101S unit.
Curated by The Shelf Curator · Updated June 2026
Built for apartment dwellers and homeowners with low water pressure who need a compact, tankless-style RO system that fits in tight under-sink cabinets. Not for enthusiasts looking for high-flow industrial output — this shop focuses on space-saving efficiency and DIY maintenance.
Curator's pick: RO-101S Morion Reverse Osmosis System
It’s the only unit I’ve tested that runs reliably on 2 atmosphere pressure without an electric pump, thanks to its internal water-on-water tank. Most RO systems waste gallons of water to make one, but this design cuts that waste significantly while keeping the footprint small.
⚠ Worth knowing: Replacement filters use a proprietary click-and-lock design, meaning you are locked into Aquaphor-branded cartridges and cannot use universal 10-inch housing filters. If you want the lowest possible long-term maintenance cost through generic parts, this isn't the system for you.
Pre-Filtration Basics: Whole House Sediment ShieldsCountertop Distillers for Zero-Plumbing Water PuritySmart Kitchen Upgrades: Leak Sensors and Auto-Shutoff Valves
The AQUAPHOR RO-101S Morion Reverse Osmosis System provides comprehensive water purification for households. This compact system is designed for consumers who want to remove a wide range of dissolved impurities, chlorine, and sediment from their tap water. It solves the problem of contaminated or poor-tasting drinking water directly from the faucet.
Compact under-sink design
Removes dissolved impurities
Integrated storage tank
Up to 100 GPD flow rate
For municipal water sources
In this shop: The RO-101S Morion system is the central product around which the Aquaphor RO 101S Reverse Osmosis Filter System guide is built.
The K5 Replacement Sediment Filter serves as the initial stage of filtration in the RO-101S system, capturing larger particles. This filter is for RO-101S owners to protect subsequent, finer filters from premature clogging. It addresses the issue of visible particulate matter and sediment in tap water.
Initial filtration stage
Removes sand, rust, sediment
Polypropylene material
Quick-change cartridge
Avg. 3-6 month lifespan
In this shop: The K5 filter is essential for maintaining the 'Aquaphor RO 101S Reverse Osmosis Filter System' by protecting the core components from large particles.
The K2 Replacement Sorption Filter provides deep purification by removing chlorine and organic compounds from the water. It is intended for users of the RO-101S system who want to eliminate odors, improve taste, and further purify their water before it reaches the RO membrane. This filter ensures the removal of common chemical contaminants.
Activated carbon block
Removes chlorine, organic chemicals
Enhances water taste
Quick-change cartridge
Avg. 6-12 month lifespan
In this shop: The K2 filter reinforces the 'Aquaphor RO 101S Reverse Osmosis Filter System' by ensuring effective removal of chemical impurities prior to membrane filtration.
The RO-50S Replacement Membrane is the core component of the reverse osmosis system, responsible for removing dissolved solids, heavy metals, and bacteria. This membrane is for RO-101S owners needing to replace their main filtration element. It solves the problem of high levels of total dissolved solids and microscopic contaminants.
Semi-permeable membrane
Removes dissolved solids, metals
0.0001 micron filtration
Quick-change module
Avg. 1-2 year lifespan
In this shop: The RO-50S membrane, as the primary filtration element, is crucial to the performance of the 'Aquaphor RO 101S Reverse Osmosis Filter System'.
The K7M Replacement Mineralization Filter reintroduces beneficial minerals like magnesium and calcium back into purified water. This filter is designed for users of the RO-101S system who prefer mineral-enriched water for health benefits and taste. It addresses the issue of demineralized water often produced by reverse osmosis systems.
Adds beneficial minerals
Improves water taste
Post-filtration stage
Quick-change cartridge
Avg. 6-12 month lifespan
In this shop: The K7M filter completes the 'Aquaphor RO 101S Reverse Osmosis Filter System' by enhancing the remineralization of purified water.
The Under Sink Water Leak Detector is a safety device that alerts users to the presence of water in undesirable locations. It is for any homeowner installing an under-sink water filtration system, regardless of brand. This device solves the potential problem of unnoticed water leaks causing extensive damage to cabinetry or flooring.
Detects water leaks
Audible alarm indication
Battery-operated
Compact size
Helps prevent water damage
In this shop: While not part of the RO system itself, the leak detector is a highly pertinent accessory for safeguarding any 'Aquaphor RO 101S Reverse Osmosis Filter System' installation.
