Your fall top sellers are here. Check out what’s trending this season. Shop Now >

Link to Lowe's Home Improvement Home Page

Prices, Promotions, styles, and availability may vary. Our local stores do not honor online pricing. Prices and availability of products and services are subject to change without notice. Errors will be corrected where discovered, and Lowe's reserves the right to revoke any stated offer and to correct any errors, inaccuracies or omissions including after an order has been submitted.

Matterhorn 400 GPD, Tankless RO, 2:1 Pure to Drain Ratio Triple-stage Multi-method Reverse Osmosis Filtration System

Superior Water Purification: Effectively removes up to 99% of impurities found in tap water such as chlorine, arsenic, fluoride, lead, and much more to ensure that your family is drinking the cleanest and healthiest water possible.
High Capacity: With a capacity of 400 gallons per day and a flow rate of up to 0.4 gallons per minute, this system provides a constant supply of purified, high-quality water for your home.
3-in-1 Filtration: The first stage filter uses a combination of a sediment filter and carbon block to remove dirt, sand, dust, rust, and chemicals like chlorine, pesticides, radon, benzene, VOCs, and more, Then the 2nd stage filter, which is the reverse osmosis membrane removes even smaller particles down to 0.0001 microns plus 1000 more contaminants like heavy metals (arsenic, lead, iron, mercury, and more), harmful chemicals (fluoride, chlorine, chloramine, PFAS (forever chemicals) and more) and reduces TDS (total dissolved solids) levels, Lastly, the third stage filter, a granular activated carbon cartridge, eliminates any lingering gases, foul tastes, and odors to enhance the taste of the purified water.

Best Price. Guaranteed

Find a lower price on an exact item? We'll match it. Some exclusions apply.

FREE Returns

Return it in store or ship it back for free. Eligibility rules apply.

Pay Your Way

Credit card, PayPal or Buy Now, Pay Later options available at checkout. Your choice.

A tankless reverse osmosis system that can produce up to 400 gallons per day is a powerful solution for providing high-quality, purified water for residential use. The Matterhorn MRO-5400 tankless reverse osmosis system is designed to be sleek and compact, making it an ideal option for those with limited space. It can be installed under the sink or in any other convenient location, and its compact size makes it a great option for apartments, RVs, small homes, coffee shops and more. The advanced filtration technology used in this system can remove up to 99% of contaminants commonly found in tap water such as chlorine, lead, fluoride, arsenic, and more. With this system, you can enjoy clean, safe, and great-tasting water from the convenience of your home.

Superior Water Purification: Effectively removes up to 99% of impurities found in tap water such as chlorine, arsenic, fluoride, lead, and much more to ensure that your family is drinking the cleanest and healthiest water possible.
High Capacity: With a capacity of 400 gallons per day and a flow rate of up to 0.4 gallons per minute, this system provides a constant supply of purified, high-quality water for your home.
3-in-1 Filtration: The first stage filter uses a combination of a sediment filter and carbon block to remove dirt, sand, dust, rust, and chemicals like chlorine, pesticides, radon, benzene, VOCs, and more, Then the 2nd stage filter, which is the reverse osmosis membrane removes even smaller particles down to 0.0001 microns plus 1000 more contaminants like heavy metals (arsenic, lead, iron, mercury, and more), harmful chemicals (fluoride, chlorine, chloramine, PFAS (forever chemicals) and more) and reduces TDS (total dissolved solids) levels, Lastly, the third stage filter, a granular activated carbon cartridge, eliminates any lingering gases, foul tastes, and odors to enhance the taste of the purified water.
Conserve Water: With a 2:1 filtered-to-waste water ratio, this system is designed to conserve water, A 2 to 1 pure-to-waste water ratio means that for every 2 gallons of purified water produced, only 1 gallon of wastewater is produced, This helps to conserve water resources, making it an environmentally-friendly choice for your home and saving you money on your water bill.
Space-Saving: The tankless design allows you to save a lot of space as it doesn't require any bulky tank to take up valuable space, making it ideal for small homes, RVs or apartments.
Easy Installation & Maintenance: With color-coded connections and leak-free fittings, this system is easy to install, so you can start enjoying clean, pure water in no time, The system's twist-off cartridges make filter replacement quick and easy, so you can ensure that your water is always purified to the highest standard.
High-quality, long-lasting components: Made with high-quality, durable materials and parts that comply with NSF/ANSI standards, This system is built to last, giving you many years of worry-free operation.
Lifetime Technical Support: If you have any issues with your product, please contact us immediately, Our customer service team and technical support are ready to help, We stand behind our products and we will make sure to rectify the issue.