Under-Sink Water Purifier Review

An under-sink water filter reduces chemicals and other contaminants from your tap water, improving its taste. You can buy a single-stage or two-stage model that improves the odor and taste of municipal water, while a more advanced option filters out heavy metals and other contaminants.


Look for a gold-seal certified system that is NSF tested and meets EPA standards. It should also have a clear gallons-per-minute number.

GE Single Stage Filtration System

If you’re looking for a filtration system that’s simple and easy to install, the GE Single Stage Filtration System is a good option. This system gets lots of positive reviews for its filtration performance and how well it improves the taste and quality of home well water and municipal tap water. It also protects your plumbing from damage caused by sediment and chlorine.

The system’s carbon spun-fiber filter reduces chlorine, lead, cysts and VOCs. It also filters out bad taste, odor and sediment from the water. The system has a chrome control knob that makes it easy to turn the filtered water on or off. The system is designed to fit under your sink and can be installed in less than three minutes thanks to push-to-connect fittings.

This under-sink filtration system is one of the more affordable options on this list, so it’s an excellent choice for households that are budget-minded. It has a digital display monitor that tracks the filtration process and lets you know when it’s time to change the filter. The monitor also beeps to alert you when the filter is low on capacity.

The GE system doesn’t remove as many contaminants as other models, but it does an adequate job for the price. The filtration system meets NSF standards 42 and 53. However, it’s important to note that the number of contaminants removed by any given filter depends on the specific filter used.

iSpring RCC7AK 6-Stage Reverse Osmosis System

The iSpring RCC7AK 6-Stage Reverse Osmosis System uses an innovative design to make it easier than other reverse osmosis systems to change the filters. Simply loosen the cap on the filter housing and remove the old filters before screwing in the new ones. It will only take you about 5 minutes to replace the whole set of filters. The system also includes a handy wrench to help you tighten the filters easily.

This system features a large storage tank that can hold up to 3.2 gallons of water and automatically refills when the tank is empty. It also uses an Alkaline Remineralization filter to add back in healthy minerals like magnesium and calcium that were stripped during the reverse osmosis process. The result is that the water has balanced alkalinity and tastes more natural than other filtered water.

Like other reverse osmosis systems, the iSpring RCC7AK has a clear container to show you when it’s time to change the pre- and post-filters. The carbon and reverse membrane will need to be replaced every six months or so, while the two-part repressurization pump will last for one to three years.

This unit can be used to dispense clean drinking water or for other household purposes such as mixing baby formula, chemical-free cleaning or for filling up a fish tank. Installation is easy, but the unit needs a dedicated outlet underneath the sink and it can be somewhat noisy.

Aquasana AQ-5300 2-Stage Water Filtration System

This Aquasana system is a bit more expensive than the other two we reviewed, but it also boasts a nice, stylish faucet that’s 100% lead-free and comes in brushed nickel, oil-rubbed bronze, and chrome to match your kitchen decor. It’s easy to install, too, with a DIY kit that includes everything you need to hook it up under your sink.

The AQ-5300 uses three filters that are good for 500 to 800 gallons each, depending on the cartridge you choose. The first stage removes toxins and other contaminants like chlorine, while the second filter helps to reduce the amount of unhealthy heavy metals in your water. The third and final filter is a unique one because it not only purifies the water but also adds back in beneficial minerals, like calcium, magnesium, and sodium ions.

The system also has a digital display monitor that lets you know when it’s time to change your filters. It will let you know when the filters are low (10 percent) and then begin to beep, making it easy to keep your water pristine.

You can also get an app for your smartphone that will track the number of gallons that have been filtered and even remind you to change the filters. Changing the filters is as simple as twisting off the old ones and screwing in new ones, and no special tools are needed.

Aqua-Pure AP-1000 Whole House Water Filtration System

The Aqua-Pure AP-1000 is a whole house water filter that installs under the sink to provide fresh drinking water for the entire household. It uses a dual stage, multi-gradient sediment and granular activated carbon filter to reduce chemicals and contaminants in the water. It’s designed for use with chlorinated municipal or private well water. It meets NSF 42 standards and removes chlorine, chloramines and particulate matter, as well as odors and flavorings from the drinking water.

It’s an excellent option if you’re concerned about heavy metals, nitrate fertilizers, herbicides and pesticides from runoff on or near your home. It can also help with bacteria, parasitic cysts and VOCs like methyl tert-butyl ether. This system is easy to install and works with existing water pressure. The included 1/4″ push-in fittings and tubing make it easy to connect the unit. The reusable filter cartridges last for up to a year for a family of four between replacements.

This system is an economical alternative to bottled drinking water and provides fresh, clean water at the point of use. It reduces sediment, chlorine taste and odor, lead, turbidity, heavy metals, VOCs and parasitic protozoan cysts. It’s also backed by a 3-year limited warranty and has excellent water flow rate, making it perfect for families. This model requires a regular change of the filter cartridge, which can be done without a plumber.