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  • Watts WP5-50 Premier Five-Stage Manifold Reverse Osmosis Water Treatment System
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Watts WP5-50 Premier Five-Stage Manifold Reverse Osmosis Water Treatment System

by Watts
| 57 answered questions

List Price: $249.00
Price: $208.84 & FREE Shipping. Details
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  • 5-stage manifold reverse osmosis water treatment system offers a continuous supply of water for the whole family
  • Manifold design provides seamless water path, effectively eliminating 17 connections
  • Nitrate reduction
  • NSF tested and certified
  • 3-year limited warranty
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6 new from $204.25 4 used from $107.06
This item’s packaging will be visible when delivered and cannot be gift-wrapped.
$208.84 & FREE Shipping. Details In Stock. Ships from and sold by Amazon.com.

Frequently Bought Together

Watts WP5-50 Premier Five-Stage Manifold Reverse Osmosis Water Treatment System + Watts 7-PK RO Filters Premier 1-Year 5-Stage Reverse Osmosis Replacement Filter Kit + HM Digital TDS-EZ Water Quality TDS Tester, 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 3% Readout Accuracy
Price for all three: $259.26

Buy the selected items together

Product Information

Technical Details
Part Number 500057
Item Weight23 pounds
Product Dimensions5 x 16 x 16.5 inches
California residentsClick here for Proposition 65 warning
Item model numberWP5-50
Item Package Quantity1
Warranty Description3-Year Limited Warranty
Additional Information
Best Sellers Rank #20,513 in Home Improvement (See top 100)
Shipping Weight23 pounds (View shipping rates and policies)
ShippingThis item is also available for shipping to select countries outside the U.S.
Date First AvailableNovember 21, 2005
Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Product Description


The Watts Premier Five-Stage Reverse Osmosis Water Filtration Device is the most complete water filtration system available on the market. Featuring a five-stage filtration process, the RO incorporates sediment, coconut-shell carbon, and reverse osmosis technologies to provide great-tasting, bottled-quality water straight from your tap.

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Five-stage filtration and reverse osmosis provide cleaner water straight from the tap.

During the lifecycle of a single filter, you can save up to 16,000 plastic bottles from being deposited in landfills.
Five-Stage Filtration Removes Contaminants
The Watts RO filters in five stages to ensure that your drinking water is as healthy and clean as possible. Once the system is connected, water passes through a 5-micron sediment filter that traps particulate matter--such as dirt, rust, and silt--that can affect the taste and appearance of your water. Next, a 5-micron carbon block filter reduces chlorine taste and odor, as well as other materials that can give water a bad taste. For the third stage, another 5-micron carbon block filter further reduces chlorine, as well as difficult-to-remove chloramines.

Reverse Osmosis for High-Quality Drinking Water
The system's fourth stage of filtration is especially important, as it involves the passage of water through the reverse osmosis (RO) membrane. This semi-permeable membrane effectively removes arsenic, lead, perchlorate, chromium, copper, TDS (total dissolved solids), sodium, and a long list of other water contaminants. It also removes parasytic cysts, such as giardia and cryptosporidia.

The fifth stage of filtration utilizes a high quality GAC filter, which works as a final polishing filter when the water leaves the storage tank on its way up to your faucet. The end result is consistently great-tasting water at just pennies per gallon.

The Importance of Drinking Clean Water
Water is critical to proper food digestion, kidney health, brain function, blood health, joint functionality, and more. It's important to make sure that the water you drink is devoid of contaminants. Thankfully, using a Watts water filtration device will ensure consistent quality for all of your drinking and cooking needs. In fact, when you use Watts' high-quality certified water treatment devices and filters, your water will be free of chlorine taste and odors, particles, and many other contaminants that can be detrimental to your health.

*Please refer to the Performance Data Sheet for the complete list of claims for which this system is certified.

Not only is the RO filter a healthy choice for you, but it's also a healthy choice for the environment. This filter helps you minimize the harmful environmental consequences of buying bottled water. Incredibly, if a mere ten percent of North America's bottled water intake were reduced by switching to home-filtered water in reusable containers, we could eliminate:

  • 133,000 trucks driving an average of 500 miles--saving nearly 12 million gallons of diesel fuel
  • Over 100 million pounds of greenhouse gasses--equal to taking 1,100 cars off the road annually
  • 213 million pounds of PET--equal to 1.5 million barrels of crude oil or improving the PET recycling rate by 10%

Depending upon which Watts water-filtration product you use, you can prevent up to 16,000 half-liter bottles from being deposited in landfills--all in the time it takes to use and replace a single filter.

The Watts Premier Five Stage Reverse Osmosis Water Filtration Device is backed by a three-year limited warranty.

What's in the Box
Five-Stage Reverse Osmosis Module (complete with filters), parts bag (with a 10-inch final filter), 3-gallon storage tank, faucet assembly, and manual.

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Num. of Filtration Stages122335
Arsenic, Nitrates,   
Chrome, TDS,   
Perchlorate, Turbidity   
Dimensions (L x W x H)6 x 6 x 1414 x 6 x 1614 x 6 x 169 x 3.5 x 146 x 4 x 1617 x 17 x 6
Replacement Filters5-Mic Carbon BlockPurifier Filter Pack560088560039560017Annual Filter Pack

Customer Questions & Answers

Customer Reviews

4.0 out of 5 stars

Most Helpful Customer Reviews

328 of 335 people found the following review helpful By Robert Kaufman on April 12, 2009
Verified Purchase
For an aspiring indoor hydroponic vegetable gardener like Your Humble Narrator, a source of clean water is essential. Here in suburban Salt Lake City, we are blessed with some of the dirtiest water in the country. Using this meter: pH-EC-TDS Meter my tap water clocks in with a pH of 8.2-8.4 and TDS (Total Dissolved Solids) reading of 300-350 ppm (parts per million). This review specifically addresses the suitability of the Watts WP5-50 reverse osmosis system to the task of providing a water supply for the home hydroponic gardener.
I've used other filtration devices, like straight carbon filters, and have been disappointed. Yes, they do remove sediment and some contaminants, however the drinking water never genuinely tasted "clean". Moreover, taking the testing meter to this water, and the TDS reading never went below 280 ppm which is unacceptable for hydroponic growing. After doing some research, I concluded that the only option was reverse osmosis.

Package Inspection

Out of the box everything looked okay with the exception of the faucet, which, as other reviewers have noted, is a cheaper version of the displayed product.


Installation was straightforward. The instructions, while not written by an English professor were sufficient albeit vague in a few critical places. I had the unit installed within two hours.

Waste Water, Output Water Quality and Quantity

My three biggest concerns with this product are output water quality, output water quantity and waste water production.
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105 of 109 people found the following review helpful By K. Keller on March 11, 2008
I have one of these that is about 10 years old now and it still works great. Of course I change the filters as recommended. We have a well with sulfur and iron in the water but the water out of this unit is perfect. We use the RO water in our coffee maker and we don't get any scale buildup. I have no problem getting replacement filters as these are standard 10" size. Watts Premier also has a great website and will even remind you when it is time to change the filters.
I just read an article about trace amounts of pharmaceuticals in the water supplies in many states. The article said that normal filtration does not remove the pharmaceuticals, but RO filtration does.
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97 of 101 people found the following review helpful By MoT on February 21, 2008
Verified Purchase
I wasn't looking to buy a new R/O system but couldn't find the filters for our old one so instead of wasting more time searching for them I opted for this entirely new Watts unit. There was a very long delay in shipping and I'd felt the order had been lost but before all hope had evaporated the boxes arrived and I got into the swing of installing everything. Give or take an hour or two, for someone as plumbing challenged as I am, everything was up and producing water. Following the manufacturers advice two tanks were run through before we started using the water and I have to say it works wonderfully and tastes absolutely great. It produces more than enough for our family of six for cooking and drinking and is very well built. Very pleased and will order another for my new house.
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66 of 68 people found the following review helpful By --Art on February 19, 2009
The only major problem is that the faucet is cheapo chromed plastic. I bought a nice brushed nickle one at Lowes.

Filter price is nice. $40 on amazon for a 7 filter pack good for one year. They are standard filters too so you don't have to buy Watts replacements. You will have to spend $65 more every 2-5 years for the membrane.

Not too hard to hook up if you don't have to cut a hole in your sink. Lots of connections to make. Make sure you only use teflon tape where the instructions specify it.

Fast water flow. Tank takes hours to fill. Unless you need more than a bucket full within a few hours you wont run out of fast clean water.

Tank is a little shy of 12" x 16". It fits behind the drain pipes of my sink, but I had to remove the bottem of the cabinet (which was warped and water damaged anyway so due for replacement) to get it past the pipes. Would have fit in front, but didn't want to loose the space.

Wattspremier web site has a FAQ if you need more info:

RO wastes water, but I used to waste water by running the water for a bit before filling my glass.

Iron is bad for a RO membrane. You can buy a TDS water tester on ebay for about $20 to monitor how well the membrane is doing.

Water pressure should be 40-85 psi. Pump or pressure relief valve may be required otherwise.

You should sanitize an RO system yearly with a little bleach.
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49 of 52 people found the following review helpful By Ken M on January 14, 2010
Verified Purchase
I finished up with my install of the 'Watts Premier WP5-50' RO unit about an hour ago. I replaced a 3 stage rental unit that never seemed to make very much water as it was not maintained very well by the rental company. I am guessing it was a 18 gallon per day unit, they would change a filter once a year and never did sanitize (not hard to do) the unit. A membrane change happened about every three years.

The WP5-50 start up instructions say to flush the tank twice so that is what I am doing as I am typing this. The thing is NSF certified so I am not worried about the initial water quality, I mainly just wanted to state a few things that would be important to anyone considering a purchase.

1. The faucet is a good quality metal chrome air gap type with a plastic on/off lever. The hoses were already connected and mostly cut to size. I did cut about a foot off of the drain connection for a better fit. The faucet matched the quality of my rental unit's faucet. I am happy with that.

2. The faucet made a bit of a hissing noise until I let the system fill a little and drain a few times. I would guess that was just air in the system. The unit is now just making a low gurgling type sound that my rental unit always made, the WP5-50 is actually quieter than my old rental unit. All under sink reverse osmosis (RO) devices will make some type of noise, the air gap faucet (required by many plumbing codes) is a little noisier than a non air gap faucet.

3. The install took about an hour, I did already have a sink cut-out for the faucet as well as one for the drain, that saved some time. The flow restrictor is inside a hose already attached to the manifold.
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Watts WP5-50 Premier Five-Stage Manifold Reverse Osmosis Water Treatment System
This item: Watts WP5-50 Premier Five-Stage Manifold Reverse Osmosis Water Treatment System
Price: $249.00 $208.84
Ships from and sold by Amazon.com