Watts Reverse Osmosis 4 Stage Systems Review

Overall: The Watts reverse osmosis 4 stage systems are durable, attractive and efficient.

The Watts 4 stage reverse osmosis water filter system thoroughly filters your water for better consumption.

Even though the watts reverse osmosis 4 stage systems take up a lot of space and is a bit overpriced, it makes up for its efficiency and has fewer complaints from consumers than other brands.

We will now take a look at some advantages, disadvantages and reviews on this Watts reverse osmosis system.

Explanation of Watts 4 Stage Reverse Osmosis Water Filter

The first two stages involve pre-filters.

In the first stage, a 5 micron sediment filter is used to trap sediments such as rust, dirt and silt. These sediments will greatly affect the appearance and taste of the water.

In the second stage, a 5 micron level carbon block filter eliminates a very high percentage of chlorine, bad tastes and odor.

At the third stage, the water passes through the semi permeable membrane. As the water passes through the tiny pores of the membrane, clean and pure water passes through while contaminated water is diverted away.

Over 99 % of contaminants are eliminated in this stage. These contaminants include copper, radium, lead, total dissolved solids, arsenic and cysts.

In the final stage, the water passes through a carbon post filter. The purpose of this filter is to remove any contaminants that may have been picked up in the storage tank.

The fourth stage takes place just before the water is released through the faucet.

This ensures crystal clear water that is healthy for consumption.


  • Easy to replace filters. All replacement filters take less than a minute each to replace.
  • Four (4) stage filtration process. The two pre-filters, the membrane and the post filter allows for a thorough purification of the water. All filters work with each other to supply you with crystal clear water that not only tastes good but has no bad odour.
  • System tested and certified by W.Q.A. against NSF/ANSI standard 58 for the reduction of several contaminants.

    These certifications prove that Watts reverse osmosis 4 stage filters systems actually eliminates all the contaminants that they say they remove.

  • Three (3) year warranty. The three (3) year warranty on the Watts reverse osmosis 4 stage systems allows you to replace or be reimbursed should your system break or malfunctions.

    Watts urges all their customers to hire a professional to install their reverse osmosis water purifier system. That is why the warranty for their 4 stage filter does not cover defects from improper installation.


  • Cost. This particular Watts reverse osmosis system will cost you roughly $300 for the unit. Additional costs include replacement cartridges for the pre-filters, the post filter and the membrane.

    The pre-filters and post filter should be changed every 6 months, while the post filter will last a bit longer.

  • Leaks. Customers often complain about leaks for the reverse osmosis system;specifically, the faucet.

    A leak from the faucet usually originates from improper installation.

    Watts has addressed the leaking problems from its systems by redesigning the entire unit.

  • Wastes a lot of water to produce clean filtered water.

    Watts 4 stage reverse osmosis system uses between 3 to 4 gallons of water to produce 1 gallon of pure filtered water.

Key Features of Watts Reverse Osmosis 4 stage Systems

  • Sale price $270, original price $400
  • Weighs roughly 20 pounds. Its not lightweight but at the same time its not heavy.
  • Will supply you with 50 gallons of clean filtered water a day. 50 gallons a day is more than sufficient for a family of four for a day.
  • Watts reverse osmosis system is easy to clean. In fact, cleaning only requires a little sanitizer for a few minutes followed by flushing the filter.
  • You can connect the watts reverse osmosis filter to your refrigerator. This eliminates the need to buy any more refrigerator filters every six months or so.

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