Under-Sink Water Purifier

If you’re looking for a simple under-sink water filter that reduces harmful traits in your tap, this budget-friendly option is a good choice. It removes 99% of lead from drinking water and is easy to maintain.


This three-stage system uses a sediment filter to eliminate particulates like sand and silt in well water before moving on to pre-carbon and carbon block filters to filter out chemicals including fluoride, chlorine and chloramines. It also tackles a cohort of contaminants including pharmaceuticals, herbicides and pesticides.

Types of contaminants

Water filters remove contaminants that affect the taste, health, or safety of your home’s water supply. Each system type specializes in reducing specific contaminants, and some systems can even eliminate some types of bacteria and viruses. Whether you’re concerned about arsenic, chlorine, or other impurities, there is an under-sink water filter that will fit your needs.

Primary contaminants are detrimental to your health and include bacteria, cysts, radionuclides, disinfectants, and organics. Microorganisms are the most common primary contaminants and can cause illnesses such as diarrhea, vomiting, nausea, and fatigue. These organisms are usually found in city-treated water, but can also be present in private wells.

Many under-sink water filters use a reverse osmosis (RO) system to reduce dissolved solids and contaminants. These systems send water through multiple stages that can include pre-filters, carbon block and granulated activated carbon (GAC) filters, a RO membrane, and post-filters. Some systems even have a buffering system that restores minerals in the final stage of filtration.

Non-RO under-sink systems often use a multistage filtration process to reduce contaminants that impact health and taste. Some examples of these types of systems are the APEC Essence 5-Stage Reverse Osmosis System and the Hydro + range of inline filters. These systems are effective at removing chlorine, sand, silt, organic compounds, fungicides, herbicides, and heavy metals.

Filter cartridges

Under-sink water filters are designed to filter contaminants out of your drinking water before they reach you, so you can enjoy a safer and healthier beverage every time. Most models use either carbon or reverse osmosis to remove harmful substances from your tap water. Carbon filters work by absorbing contaminants in your water and reverse osmosis works by forcing your water through a semi-permeable membrane to eliminate volatile organic compounds, pharmaceuticals, herbicides, pesticides, heavy metals and fluoride.

Most under-sink water filters come with different replacement filter cartridges depending on the type of contaminants you want to target. Cartridges with a lower micron rating are typically better for targeting bacteria and cysts, while higher ratings are better at eliminating chemicals and other contaminants like lead, chlorine, PFAS and herbicides. The lifespan of your under-sink filter will also vary depending on its contaminant reduction abilities, surface area, pore size and quality.

If you’re looking for a specialist option, some under-sink water filter models use granular activated carbon (GAC) or ion exchange resin to remove hardness minerals and other contaminants from your tap water. Some also include a bed of activated alumina granules to help remove fluoride from your tap water. You can also find a wide variety of other types of specialist under-sink filter cartridges, all of which have different micron ratings and surface areas to ensure that you get the best possible filtration results for your home’s water.


Under sink water filters offer the convenience of on-demand filtered drinking water. They remove contaminants that make your tap water unfit for consumption and do not require the maintenance of a storage tank like whole-house water filter models. The filtration method differs between models, with some using reverse osmosis and others adopting carbon filtration or water ionization.

In terms of installation, most models come with a detailed user manual that outlines the process. If you’re not confident in DIY plumbing, a plumber should be hired to ensure the system is installed correctly and to prevent any leaks. Some systems also use plastic piping which may not be suitable for long-term usage, so you should consider investing in some metal supply lines.

To start with, locate the area under your sink and mark the points where the unit should be positioned. Check the manufacturer’s information for details on how to drill the hole, which should be the size of a standard faucet. Next, assemble the filter head and connect it with your water line. If you’re using a two-stage model, attach the sediment and carbon filter cartridges as well. Once the assembling is done, turn on your tap and test the water to see if it’s clean. If you’re not satisfied with the quality, then it’s time to change your filter cartridge.


Under-sink water filters are more affordable than ever and can help you save money in the long run. However, they still require regular maintenance to prevent bacterial growth. This includes flushing out the system to ensure it’s clean and free from germs and bacteria. The flushing process involves disconnecting the filtration system from the water supply and running water through it for a minimum of five minutes. This will displace any bacterial growth that may have developed in the filter and prevent foul, algae-like tastes and smells from spoiling your coffee, tea, and ice.

A common water filtration system consists of a sediment filter, carbon filter, and post-filter that removes sediment, chlorine, and other contaminants from your tap water. It also reduces odor and other unpleasant tastes and keeps minerals in the water that contribute to its natural flavor. Most filtration systems are easy to maintain. They come with automatic switch on-offs that avoid wasting water during filtration and filter replacement alarms to remind you when the filters are due.

The most common under-sink water filtration system is the reverse osmosis filter. It requires two or three canisters and a tank to hold water for filtration. These types of under-sink filtration systems take up a lot of space under the sink, but they are extremely effective in reducing contaminants. They are a great alternative to buying bottled water because they offer a cost-effective and eco-friendly way to get pure and healthy drinking water.