Taking the 7th spot on our list is the iSpring US31 under sink water filtration system. iSpring is a famous company in the water filtration industry known for producing top-of-the-line water filtration systems particularly reverse osmosis systems and replacement parts.
The company now includes under sink water filters on their long list of products and the US31 is one of their best models that has made a significant mark on the market.
It has been built to the same level of quality we’ve seen in most of iSpring’s systems with an aim to provide a convenient and efficient way to facilitate the supply of clean, healthy water.
To start, the iSpring US31 filter system features a more standard design with 3 separate stages of filtration that work to remove a lot of harmful contaminants.
In the 1st stage, the water flows through a universal 10” polypropylene sediment filter where common sediments are cleared out down to 5 microns.
It removes sand, dust, rust, dirt and all tiny particles which not only improves the purity of water but also helps protect and extend the life of the system itself.
The 2nd stage contains 5-micron CTO carbon and GAC filter which is a combination that effectively removes chlorine, chloramine VOCs, and many more common chemicals that contaminate the water and cause colors, cloudiness, bad tastes, and odors. These two filters also help reduce the number of heavy metals like lead and arsenic present in the water.
From there, the water goes through another CTO carbon filter in the 3rd stage where the remaining chlorine, chloramine, VOCs and other chemicals, as well as heavy metals, are further extracted from the water thereby improving its taste, smell and clarity.
These three stages will remove all these contaminants without losing the minerals in the water as is the case with RO systems.
The filter is equally designed to control and discourage bacteria and parasites from developing in the water, thereby if bacterial contamination is of concern, then you are guaranteed that the filtered water produced at the faucet will be of great quality.
Capacity and Efficiency
This US31 model from iSpring is rated to provide up to 2000 gallons of water which is sufficient capacity to give you almost one year of service before you can replace the filter cartridges.
Basically, depending on the usage and water quality, you will have to change the filter cartridges every 6 to 12 months. The higher the usage and level of contamination, the shorter the lifespan will be.
The flow rate, on the other hand, can reach up to 1 gallon per minute again depending on your source water pressure. It may not be that high, but it’s just fast enough to ensure you constantly have access to clean water on demand straight from your tap.
Installation and Maintenance
Installing and maintaining the US31 is a somewhat simple task although you may have to drill an extra hole into your countertop since it uses a separate faucet included in the kit.
If you are handy or have some basic DIY skills, it could take less than 30 minutes to set it up and the kit has everything you need including the feed water adapter, tubes, fittings adapter, a wrench, and a clear and easy-to-follow installation manual.
All three filter cartridges require replacing every 6 to 12 months and as we mentioned above, this will depend on your usage and the level of contamination of your water.
Changing the filter is as easy as installing them the first time and even much better, the 1st stage filter has a clear see-through housing to enable an easier visual inspection of the cartridge so that you can always replace it at the right time.
Moreover, the system can handle a maximum pressure of 90 psi, so the fittings are not going to blow apart and come out with the standard 60 psi municipal water pressure.
Considering that the 3-stage filtration process is highly effective in removing different contaminants and the capacity is reasonably large, the iSpring US31 is a unit that we would recommend to anyone looking for quality and reliability.
- Will effectively remove sediment, chlorine, and several different contaminants
- Keeps essential minerals and prevents bacteria from thriving in the water
- Relatively high capacity of up to 2,000 gallons of water
- Simple DIY installation and maintenance process
- Has a clear see-through 1st stage housing for an easy visible inspection
- Comes with a durable, brushed nickel all-metal dedicated faucet
- Backed by a 1-year limited warranty
- The flow rate is a bit low at 1 GPM
- Meant for use with only municipal water
Price & Rating
|Product||iSpring US31 3-Stage Under Sink Water Filter Reviews|
|Rating||(More than 102 reviews)|
|Recommended price||115.07 USD (Check the latest price at Amazon.com)|
|Features||Clear see-through 1st stage housing|
|Flow rate||1 GPM|
|Filter changing indicator||N/A|
|Faucet||European-designed brushed nickel|
|Dimensions||16 x 6 x 16 inches|