Watts Premier Ro-Pure Plus Filters

Water quality concerns are becoming more of a focus for the public. You may have heard about contaminants in the drinking water such as Arsenic, Chromium, Cryptosporidium, or Giardia. There may also be some local water issues such as high levels of Lead and Copper.

Ro Pure Plus

The design of the Watts Premier Ro-Pure Plus Filters treatment system is to provide you with high-quality drinking water for years to come. The following is a brief overview of the system.

System Overview

Watts Premier Ro-Pure Plus Filters

Osmosis is the process of water passing through a semi-permeable membrane to balance the concentration of contaminants on each side of the membrane. A semi-permeable membrane is a barrier that will pass only certain particles like clean drinking water but not other particles like arsenic and lead.

Reverse osmosis uses a semi-permeable membrane; yet, by applying pressure across the membrane, it concentrates contaminants (like a strainer) on one side of the membrane, producing crystal clear water on the other. The RO systems produce both clean drinking water and rinse water. This reverse osmosis system also utilizes carbon block filtration technology and can, therefore, provide a higher quality drinking water than carbon filtration systems alone.

Your system is a four-stage RO which is based upon separate treatment segments within the one complete water filtration system. These stages are:

Sediment filter, recommended change six months

The first stage of your RO system is a five-micron sediment filter that traps sediment and other particulate matter like dirt, silt, and rust which affect the taste and appearance of your water.

Carbon filter, recommended change six months

The second stage contains a 5-micron carbon block filter. This helps ensure that chlorine and other materials that cause bad taste and odor are greatly reduced.

Membrane, recommended change 2-5 years.

Stage three is the heart of the reverse osmosis system, the 50GPD (Gallons Per Day) RO membrane. This semi-permeable membrane will effectively remove TDS, Sodium, and a wide range of contaminants such as Chromium, Arsenic, Copper, Lead as well as Cysts, such as Giardia and Cryptosporidium. Because the process of extracting this high-quality drinking water takes time, your RO water treatment system has a storage tank.

VOC Block filter, recommend change 12 months

Watts Premier RO-Pure Plus system conforms to NSF/ANSI 58 for VOC reduction. Through the specialty formulated VOC post filter, your system is capable of reducing harmful Volatile Organic Chemicals (VOC) like MTBE’s, Atrazine, Benzene, 2,4-D, Lindane, and others from your drinking water. The estimation is that VOCs are present in one-fifth of the nation’s water supplies. These water contaminants can enter groundwater from a variety of sources, including localized use of herbicides and pesticides, gasoline or oil spills, leaking underground fuel tanks, septic system cleaners, and chemicals used in the dry-cleaning industry. See performance data sheet for individual contaminants and reduction performance.


  • Replacement filters are relatively
  • An air gap faucet is part of the system.
  • This filter system is certified.
  • The electronic filter change track indicates when it is time to replace.
  • Water output per day – 50 gallons
  • Filter life stage 1 and 2 – 6 months
  • Filter life stage 4 – 1 year
  • Membrane life – 2 to 5 years
  • No power connection required


  • The tank is a bit small.
  • A drain adapter for sinks with garbage disposal is not included.



This under-sink reverse osmosis system is easier to install than many other similar systems. Watts Premier did a great job by color-coding all tubing and parts, so you always know where pipe or filter will connect to.

The written instructions are also a big help if this is the first RO system you install—lots of images and clear instructions.

If you already have a hole for the RO faucet, then you can probably install this easily. If not, some DIY skills are necessary to drill it. Maybe you get help for this part, especially if you want to drill a hole in a granite countertop.


If you are looking for a budget reverse osmosis filter, the Watts Premier RO-Pure is a good choice. Especially if you have limited space under your sink. The removal rates are good, and regular filter maintenance is easier than with other systems.

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