Pros:

• Lives up to the promise: very clean, clear, good tasting water
• Storage tank for 3 gallons of water immediately ready
• Goes beyond smaller filters to remove TDS impurities
• Attractive, high quality faucet better than cheaper competitors
• Can also connect to in-fridge ice maker
• Straightforward installation and filter replacement

Cons:

• Four-stage means more bulk; takes up considerable under-sink space
• Reverse osmosis wastes some water, creates gurgling noise
• More filters means more expensive filter replacement

Review

The Watts Premier RO-Pure 4-Stage Reverse Osmosis System is a water purification system that installs under the sink in the home. Installation is simple and the product comes with a detailed instruction manual that has been praised for its clarity and thoroughness.

This system takes incoming water from standard plumbing pipes and puts that water through a four-stage filtration process (including reverse osmosis in the middle). Reverse osmosis results in some water wasted, so this product has two output tubes: one delivers purified water to a sleek, slim faucet installed next to the regular kitchen faucet through the auxiliary hole in the sink. The second tube routes the contaminants that were filtered out, along with some excess water, back down the drain.

This product is designed to eliminate sediment (which can cause discolored or cloudy water, as well as bad flavor), chlorine (often added at the water treatment plant), microbiological impurities (such as bacteria, viruses, and cysts) as well as a number of total dissolved solids, or TDS, (including sodium, chromium, lead, copper, arsenic, and others).

As a four-stage filter, it provides cleaner and clearer water than some of Watts’ other systems, including the company’s 1-, 2-, and 3-stage filters. This also means it comes with a higher price, requires more replacement filters, and takes up more space under the sink. However, it should still fit under standard sinks with no problem.

Owners of the Watts Premier RO-Pure 4-Stage Reverse Osmosis System give the unit high marks for water clarity, appearance, odor (none), and taste. Because of the reverse osmosis system, some excess water is drained off, which means slightly higher water usage per the amount produced. Some users found the sound of the water draining to be irritating.

Changing filters in the Watts Premier RO-Pure 4-Stage Reverse Osmosis System is easy to do. The filters are self-contained and are designed by Watts to be mess-free and require no tools. This product also includes a water storage component, which can hold up to 3 gallons of pre-filtered water at a time. This unit can also be attached to an ice maker/water dispenser, such as those found in refrigerators, eliminating the need for additional filters. Users report that the Watts system provides better tasting water than existing refrigerator filters.

Bottom line: The Watts Premier RO-Pure 4-Stage Reverse Osmosis System installs underneath the kitchen sink and provides high quality filtered water for drinking, cooking, and ice making. Its 4-stage reverse-osmosis and filtration system earns high marks from customers, even those whose municipal water is notably odorous and discolored. While somewhat bulky under the sink, this product does what it promises to do, and does so well.