Reverse Osmosis & Drinking Water Systems

Watershield Reverse Osmosis*

Water Treatment Warehouse offers a wide range of Reverse Osmosis systems. The Watershield line of Reverse Osmosis systems reduces the minerals and contaminants found in untreated water. Watershield ROs are easy to install and come equipped with a high-performance membrane and filters to purify the water to make clean, great-tasting water.

Watershield Three Stage

The Watershield Three Stage is an excellent option for your basic Reverse Osmosis applications. In the first stage, water passes through sediment and activated carbon block filter to remove physical particles as well as chemicals like chlorine. In stage 2, water passes through the thin film composite membrane to reduce up to 99% of dissolved mineral salts, metals, and other contaminants. The third and final stage is the post-filtration polishing filter; water passes through an activated carbon block filter to remove unwanted tastes and odor to provide great tasting drinking water.

Watershield Big Pump

The Watershield Big Pump is one of the most environmentally friendly units on the market. Unlike systems that pump drain back into the water supply, the Big Pump uses less water overall. By squeezing ordinary tap water against a special membrane, pure water molecules are separated from impurities. These impurities are automatically rinsed down the drain leaving only clean, great-tasting water. As a tank fills on a reverse osmosis unit, it generates back pressure on the membrane. On most reverse osmosis units, this added back pressure causes the membrane to work harder to make pure water. The Watershield Big Pump utilizes a non-electric energy recovery device, called a permeate pump, which dramatically improves the efficiency of an RO system. Therefore, by removing the back pressure, the drain amount never changes. This unit will improve recovery as much as 400% and can reduce wastewater by 80%. It also increases product tank pressure (up to 95% of feed pressure). By using less water, this also means that filters last longer and do not need to be changed as often.

Watershield 50

The Watershield 50 is a high-quality Reverse Osmosis system with high-performance production utilizing a 50 gallon per day TFC membrane. Its compact design makes great for under sink installation. Its 3 stage filtration will leave you with purer, clean, and great tasting water.

Watershield FreshPoint ®

The Watershield FreshPoint ® Reverse Osmosis and Drinking Water Systems bring you an innovative and high-quality way to get great water at your tap. The FreshPoint® line has easy click-in cartridges to make quick and easy filter exchanges. The manifolds have an easy color-coded sequence to make it easy to match up the filters for the proper filtration sequence. The filters come with a double O-ring design to optimize a tight seal to ensure leak-protection.

Reverse Osmosis vs. Water Filters Carbon filter

Reverse Osmosis/Carbon Combination Water May Contain Carbon Block or Activated Carbon

Single Membrane Industrial Reverse Osmosis Units

Water Treatment Warehouse carries the Puromax® Single membrane Industrial Reverse Osmosis line. Great for light commercial or whole-house applications. This line offers either a Low pressure 2800 GPD membrane option or a high pressure 2200 GPD membrane option. They contain a stainless steel membrane housing, a Gould’s multi-stage SS Centrifugal Pump, 2″ x 20″ Sediment Pre Filter, TDS Monitor, Low-Pressure Safety Cut Off, and a stainless steel Drain Valve. The Units are equipped with easy to read Product and Drain Flow Meters. The R/O’s are easy to Install and Maintain.


Water Treatment Warehouse offers a variety of commercial and industrial reverse osmosis solutions for almost any application through our Watershield line of equipment. WTW provides reliable, cost-effective systems engineered and built with the most up-to-date features available.



*Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the system. Systems conform to NSF/ANSI Standard 58 for pentavalent arsenic reduction. See the Performance Data Sheet and Arsenic Facts section for an explanation of reduction performance. Systems certified for cyst reduction may be used on disinfected water that may contain filterable cysts.


These systems are acceptable for treatment of influent concentrations of no more than 27 mg/L nitrate and 3 mg/L nitrite in combination measured as N and is certified for nitrate/nitrite reduction only for water supplies with a pressure of 280 kPa (40 psig) or greater.

Application Filtration size use for average flow rate

POU (Point of Use)0.0001 micron drink or cooking 45 gallons per day

POE (Point of Entry) 10-30 micron Bathroom, Shower, Cleaning and Gardening 10 Gallons Per Minute

Components of a Reverse Osmosis System

Aside from the reverse osmosis membrane, other components of a reverse osmosis system include pre- and post-filters. First, there is a storage tank that holds two to four gallons of water. Other parts include the cold water line valve that feeds water into the system and an automatic shut-off valve (SOV) to prevent your storage tank from overfilling. Located at the outlet end of the membrane housing, the check valve hampers the backward flow of permeate water from the storage tank. There is a drain line that is utilized to discard the water, which contains contaminants and impurities that have been rejected by the RO membrane. The flow restrictor component regulates the water, which flows through the RO membrane. Lastly, your system will come with a unique faucet to fit on your sink, to provide you with reverse osmosis drinking water.

Stages of Reverse Osmosis Water Filtration

Reverse Osmosis is a multi-stage water filter system that can range between 3 to 7 different cycles depending on the type you have installed. Let’s take a look at the
most common process below:

Sediment Removal

The pre-filter removes large, rough particles such as sand and rust, which can damage the system.

Carbon Removal

An activated carbon pre-filter reduces elements that cause water to taste and smell unpleasant, including chlorine.

Reverse Osmosis

This purifies water and removes dissolved solids, including anything larger than the water molecules.


Remineralizes water with calcium and magnesium to balance the pH, improve the taste and introduce healthy minerals.

Storage Tank

The water is then transferred to the storage tank, ready to be dispensed via your special faucet.

Polishing Filter

The polishing filter is a second activated carbon filter that polishes the water to make sure it’s crystal clear.