APEX MR-5051 Under Sink RO with Booster Pump

5 Stage Under the Sink Reverse Osmosis 50 GPD Drinking Water Filter System with Pump


In Stock

1 Review
Sku: 804
  • High Efficiency Booster Pump, For Very Low Pressure, 0-30 PSI
  • Top Quality Assurance Standards
  • Removes 99% contaminants from the Tap Water
  • Made from High Performance components that complies with NSF/ANSI Standards
  • Colored tubing and colored coded connection
  • Fully assembled, easy installation kit
  • Each Individually wet tested and Sanitized
  • Experience engineers and Lifetime Technical Support.


The MR-5051 reverse osmosis filtration system is a high-volume water purification system designed especially for water supplies with low or inconsistent water pressure. The reverse osmosis (RO) process requires a steady water pressure between 40 and 60 PSI to function properly. If the water pressure is too low or inconsistent, the efficiency and water output of reverse osmosis systems suffers. Water sources with low or inconsistent water pressure include wells, office and apartment complexes, and municipal water supplies with variable water pressure. The MR-5051 is ideal for RVs because campground water supplies often have low-pressure distribution systems. The high water production rate makes the MR-5051 suitable for commercial and industrial applications that require a continuous supply of purified water. These industries include laboratories, hydroponics, optical grinding and dental offices. The MR-5051 filtration process starts by first removing solid particulate matter like iron oxide (rust) particles, sand, loose calcium scale and insect parts. This prevents the filtration systems from clogging while eliminating these solids from entering your drinking water. Next, the water flows through two solid blocks of activated carbon. These twin porous compressed carbon block filters remove disinfection water treatment chemicals, like chlorine, chloramine and chlorine dioxide, that are responsible for taste and odor problems.

Carcinogenic disinfection byproducts, called THMs, are removed by the carbon filters. The twin carbon cartridges also remove organic contaminants like VOC solvents, MTBE from leaking gasoline tanks, herbicides, insecticides and industrial chemicals that seep into groundwater. The next step involves the reverse osmosis (RO) process. The booster pump automatically adjusts the incoming water pressure to the proper pressure. As water flows through the RO membranes, heavy metals, like lead, copper and mercury, are removed while purified water passes through. The RO membranes also remove sodium, chlorides, fluoride, radon and nitrate. The purified then flows through a granular activated carbon (GAC) polishing filter. This cartridge removes any traces of tastes, odors and gasses, for crystal clear, sparkling drinking water.

Figure 1.0 Function of APEX Alkaline Reverse Osmosis Drinking Water Filter

The APEX MR-5051 also includes a water storage tank and designer dispensing faucet. As the RO filtration system makes purified water, it fills the water storage tank (up to 50 gallons per day). The storage tank supplies purified water to the designer faucet for drinking, meal preparation and pets. Your regular sink faucet will provide unfiltered water for washing dishes and clean-up tasks.

The APEX MR-5051 filtration system is pre-assembled and wet-tested. The filter system can be installed with simple hand tools. We recommend installation by a licensed plumber to insure adherence to all local codes. Routine replacement of the filter cartridges is recommended to maintain filter performance. Replacement cartridges are available from APEX Water Filters.

Metpure Brushed Nickel Drinking Water Faucet

  • High quality premium Coke-style ceramic disc lever faucet crafted with solid brass exterior for durability and lasting finish
  • Included free faucet wrench eases installation time by more than half and ensures tight mount
  • connects to 1/4” tubing
  • Gooseneck that swivels 360 degrees
  • 3” shank for easy installation under sink
  • Requires 1/2” hole for minimal countertop drilling (soap dispenser hole can be used)

Where Style, Convenience & Purity Meet

Figure 1.2     Kitchen Countertop Appearence

  • pH7 Pull Down Faucet Not Included
  • Included Metpure Brushed Nickel Faucet

Filter Stages

Figure 1.1 Contaminant Removal from Filter Stage


  • Design
  • Configuration
    Single Pass
  • Feed Water Source***
    City Water or Well Water*
  • Connections
  • Input
    1/2" or FNPT
  • Output
    1/4" Tube
  • Pressure Guages
    Optional (Not Included)
  • UV Lamp
    Optional (Not Included)
  • Vessels
  • Radial Flow sediment
  • Radial Flow Carbon
  • Membrane
  • Axial Flow GAC
  • System Dimensions **
  • L x W x H Inch (cm)
    19 x 14 x 6(48x 36 x 15)
  • Weight Ib. (kg)
    17.5 (7.9)
  • Tank Dimensions **
  • L x W x H Inch (cm)
    11 x 11 x 15(33 x 33 x 38)
  • Weight Ib. (kg)

* UV ray bacteria disinfection highly recommended for well water

** Does not include operating space requirements.

*** Treatment ability of the system is dependent on feed water quality.Performance projections must be run for each installation.


  • AWater supply adapter valve
  • BCold water shut-off valve
  • CAuxiliary faucet
  • DGarbage disposal
  • EPre-carbon filter sumps
  • FDrain Saddle
  • GStorage tank with valve in open Position
  • HPre-filter sump
  • IMembrane assembly
  • JPost-filter

Figure 1.3 Under Sink Setup

Professional Plumbing Support Required for Installation

Water pressure can cause leaks and damage the surrounding building or fixtures if not properly installed. User must check all fittings for tightness. APEX assumes no responsibility for water damage due to leaks.

Operating Limits

  • Maximum Feed Temperature ℉ (℃)
    85 ( 29.00 )
  • Minimum Feed Temperature ℉ (℃)
    40 ( 4.44 )
  • Maximum Ambient Temperature ℉ (℃)
  • Minimum Ambient Temperature ℉ (℃)
    40 ( 4.44 )
  • Maximum Feed Pressure psi(bar)
  • Minimum Feed Pressure psi(bar)
  • Maximum Turbidity NTU
  • Maximum SDI Rating SDI
    < 3
  • Minimum Free Chlorine ppm
  • Maximum TDS ppm
    < 2000
  • Maximum Hardness gpg++
  • Maximum pH (Continuous)
  • Minimum pH (Continuous)
  • Maximum pH (Cleaning 30 Min.)
  • Minimum pH (Cleaning 30 Min.)

Test Parameters 550 TDS Filtered (5 MIcron),De-Chlorine,Municipal Feed Water, 65 psi(4.50 bar) Feed Pressure, 77 Degrees F(25 Degress C),7.0 pH.Data taken after 60 minute of operation.

+ Low temperatures and high feed water TDS levels will significantly affect system production capabilities. Computer projections should be run for individual applications.

++ Scale prevention measures must be taken.

Enjoy Crisp Clean Refreshing Drinking Water for Your Healthy Lifestyle.

When you choose an APEX water filter, you’ll get the absolute best water filter system for your needs from a company that values your business and will go above and beyond to ensure your full satisfaction.

Built in U.S.A

Not only can you feel good knowing that APEX Water Filters gives Americans good-paying jobs, but you can also be certain that we carefully monitor each step in the manufacturing process because we produce our filtration systems locally.

If for any reason you’re not completely satisfied with an APEX Water Filter, we’ll replace it or refund the purchase price–no questions asked.

Quality Guaranteed

At APEX Water Filters, we believe that the best water filters start with the best materials. That’s why we only use carbon that complies with National Sanitation Foundation Standards and components that are approved by the U.S. Food and Drug Administration.

Before a water filtration system leaves our facility, we test it to ensure that it meets our high quality standards. This extra step ensures that you receive a filtration system in the best possible condition.

Weight 26 lbs
Dimensions 5.2 × 16 × 17 in


  • Large capacity 5-stage reverse osmosis drinking water purification system for residential and light commercial applications
  • Includes a booster pump to maintain proper water pressure for maximum pure water output
  • 1-micron polypropylene pre-filter removes calcium scale particles, rust, sand and other microscopic debris
  • Dual high surface area 5-micron activated carbon cartridges remove chlorine, chloramine, tastes and odors, radon, pesticides and carcinogenic chemicals like solvents and MTBE
  • High-efficiency Thin Film Composite reverse osmosis membrane removes up to 99% of water contaminants like nitrate, TDS, fluoride, lead, sodium and mercury
  • Granular activated carbon post-filter removes all traces of tastes and odors as a final polishing stage
  • Easy to install kit includes water storage tank and pure water dispensing faucet
  • Pressure sensors for automatic pump control
  • Built and quality-checked in the USA

1 review for 5 Stage Under the Sink Reverse Osmosis 50 GPD Drinking Water Filter System with Pump

  1. Adalberto

    Was facing a lot of issues with the water flow and quality. The in-built booster pump of this RO helped resolve both of my issues

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