Tier1 Whole House Reverse Osmosis System - Everyday Series (350 GPD)

Price $899.00
Availability: In stock
Fits most standard water lines. System includes 3/8 inch fittings.

This item has important return policy exclusions. Please review our Return Policy.

  • Automatic shut-off valve
  • Push and pull fittings with locking safety clips
  • Use alone or as part of a larger Tier1 Whole House Solutions configuration
  • The slim line filter housings fit most standard 20 inch sediment and carbon filters
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The WH-RO-350 Tier1 Whole House (350 GPD) Reverse Osmosis System is the 4-stage free standing or wall mounted reverse osmosis solution you need. This system features a 4-stage filtering process starting with a sediment and carbon pre-filter, a high capacity reverse osmosis semipermeable membrane, and a carbon filter to round out the process. Use alone or as part of a larger Tier1® Whole House Solutions configuration. With the 4 stage system you can ensure that you have great tasting water available to your entire home. Let Tier1 be your water experts and protect every drop.

Experience the Tier1 Difference

Tier1 manufactures high-quality filtration and household products. We take creating and maintaining a healthy home seriously. Products must undergo rigorous testing and meet demanding quality expectations in order to earn the Tier1 badge. Every purchase is backed by the Tier1® Guarantee:

  • Guaranteed Fit
  • Guaranteed Quality
  • Guaranteed Price

Sediment and Carbon Filter Pre-Filtration

The 5 micron sediment pre-filter is used to reduce physical particulates from the water source. Contaminants include Sand, Rust, Silt, Soil, and more. The contaminants are captured in the filter cartridge, helping alleviate stress on the following cartridges. The first 10 micron carbon filter, part of the pre-filter process, reduces the presence of chlorine taste and odor. Most city water services will treat water with chlorine to disinfect the water, this treatment, while effective, can leave unpleasant tastes and smells that are best to filter out. Carbon media reduces out these unsavory stimuli and allows water to pass roughly unimpeded through the filter.

Reverse Osmosis Membrane

The 3rd stage of this reverse osmosis system utilizes a semipermeable membrane. This membrane is capable of reducing water soluble toxins, such as heavy metals, organics, bacteria, and pyrogens by forcing water through a membrane that only allows water molecules to pass through. This critical component of the reverse osmosis system captures a significant percentage of high toxic impurities, such as asbestos, hexavalent chromium, and lead. This systems reverse osmosis system ensures you are receiving high quality filtered water.

Carbon Filter Post-Filtration

This is the final phase of the filtration process. This 10 micron carbon filter is commonly referred to as the polishing phase since its the final filter of unwanted impurities such as chlorine taste and odor, before the water reaches your glass. This phase ensures that all unappealing and distasteful odors and smells are dealt with and the water is ready for consumption.

Frequently Asked Questions

What is Reverse Osmosis? The process of Reverse Osmosis is based on a pressurized or "reversed" form of Osmosis. Water is forced through a semipermeable membrane creating purified water by filtering unwanted particulates and contaminants. Like normal mechanical filtration, the pores of a reverse osmosis membrane only allow the free flow of water molecules, creating a flow to dispense water contaminants through a rejection or "brine" stream. The rejected water is funneled into a holding tank or faucet to be discarded.

If RO systems remove minerals, and mineral consumption is essential to health, does that mean I am reducing my mineral intake? If so, will there be negative side effects? This is a complicated question but simply put, Yes, RO systems remove minerals. But, No, there will not be any negative side effects. This is because the minerals found in water are not easily digestible. The minerals usually found in water are inorganic and are very difficult for one's body to process. The minerals found in food are primarily organic and much easier to consume. This means that the minerals removed by RO filtration are not a true source of nutrients for the drinker. That portion of our required nutrition should come from our food. RO water is clean and pure and will aid in hydration, which is water's primary purpose in the human diet.

What is the benefit of a whole-home reverse osmosis system versus a water softener? The two perform different functions. A traditional water softener is used to treat water for hardness minerals such as calcium and manganese. Softeners generally use a process such as ion exchange to attract and then ultimately remove the unwanted hardness minerals. An RO system will be much more restrictive of the heavy metals and organics that will make it to your glass. Reverse osmosis utilizes a semi-permeable membrane to remove up to 99% of the contaminants from your drinking water, a far greater filtration of contaminants than a softener. NOTE: RO systems do not perform ion exchange and therefore should not be used in place of a softener if you are looking to treat scale and or hardness buildup.

Is my city water safe to drink? Municipal services will treat water with chlorine to help reduce bacteria but they cannot treat for contaminants that are picked up along the way to your home. Aging and corroding pipes will leach metals into the water, bacteria entering the system through water main breaks and other causes lead to the water in your home being loaded with various contaminants. RO systems are fantastic at reducing these contaminants and delivering high quality filtered water.

Does this system come with a holding tank? No, tanks will need to be purchased separately and should be selected based on your water demand needs.

If I move can I take the system me? is it a permanent fixture? This RO system can be easily uninstalled and taken to your new home. lightweight slim design allows for easy transportation.

Will this RO system filter out beneficial minerals from my water? "Beneficial minerals" can be debated since the trick is to have minerals in moderation. What is important to consider is all the potentially harmful minerals and contaminants such as asbestos, hexavalent chromium, arsenic, lead and many many more which will be reduced from your water through reverse osmosis treatment. RO systems like this will remove up to 99% of the contaminants from your drinking water. The concern for your water is toxicity, not mineral content. Beneficial minerals are obtained in majority through the food we eat not the water we drink.

Package Qty 1
Used In Brands Tier1
Manufacturer's Id WH-RO-350
UPC 810004474109
Actual Size (in) 12 inches (length) x 17 inches (width) x 32 inches (height)
Actual Size (cm) 30.48 x 43.18 x 81.28
Primary Filter Media Semi-Permeable Membrane
Pre Filter Media Carbon Block
Post Filter Media Carbon Block
Micron Rating (Nominal) 5
Operating Pressure (psi) 0 - 100
Maximum Operating Pressure (psi) 90
Operating Temperature (°F) 40 - 85
Operating Temperature (°C) 4.4 - 29.4
Flow Rate (gpm) 0.24
Flow Rate (lpm) 81.28
Flow Rate (gpd) 350
Fitting Type Quick Connect
Fitting Size (inches) 3/8 inch
Color White
Warranty Guarantee Tier1® Whole House Systems: Protect Every Drop Guarantee
Primary Filter Media Semi-Permeable Membrane

Reduced Contaminants

The TIER1-WH-RO-350 reduces the following contaminants:

  • Barium
  • Cadmium
  • Chlorine Taste & Odor
  • Chromium (III / Trivalent)
  • Chromium (VI / Hexavalent)
  • Copper
  • Fluoride
  • Lead
  • Mercury
  • Nitrates / Nitrites
  • Selenium
  • Silt
  • Total Dissolved Solids (TDS)
  • Turbidity

Installation Guide

User Guide


  1. For installation instructions please read the RO System Installation Guide
  2. For additional information on the Tier1 reverse osmosis system please see the RO System Spec Sheet

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