Best CTO Under-sink Filters of 2025

The iSpring US31 Filter System offers a three-stage purification process that effectively removes sediments, heavy metals, and harmful chemicals from your drinking water. With its impressive flow rate, it can meet all your household needs, providing fresh and clean water directly from your tap. The elegant European-designed faucet and clear first-stage housing make it easy to inspect filters, ensuring your system remains in top condition. Designed for simple installation and low maintenance, you can enjoy delicious, healthy water with minimal effort.

The iSpring WGB21B Filter offers two-stage effective filtration to ensure your water is clean and fresh. The first stage captures various particles like dirt and rust, while the second stage removes over 90% of chlorine and unpleasant tastes and odours. With a superb filtration capacity, it can provide up to 50,000 gallons of purified water, which is ideal for a family of four. Additionally, it retains valuable minerals, ensuring that you enjoy healthy water without sacrificing essential nutrients.

The iSpring US15SD Filter offers a high-capacity filtration system that effectively reduces impurities such as chlorine, heavy metals, and bad tastes from your water, ensuring you enjoy cleaner, healthier drinking water. It requires significantly less space than traditional filters, fitting neatly under your sink without needing an extra faucet. Installation takes approximately 20 minutes, and changing the filter cartridge is a quick process, taking just 60 seconds. Plus, by using this system, you can help reduce plastic waste and save money by cutting down on bottled water consumption.

The Max Water Filter Set features a reverse osmosis filtration method, which means you can enjoy clean and purified water right from your under-sink tap. This product does not require power, making it an energy-efficient option for your home. The model 104002-104005 includes sediment and CTO carbon block filters, ensuring that impurities and contaminants are effectively removed. You can trust this reliable system to provide you with great-tasting water while conveniently fitting under your sink.

The Finerfilters RO Water Filter delivers exceptional drinking water quality. With its advanced filtration system, it effectively removes up to 99% of contaminants, ensuring you enjoy cleaner, safer water right from your tap. This system also includes a remineralisation feature, enriching your water with essential minerals for better taste and health. Furthermore, it can produce an impressive 190 litres of purified water daily, making it perfect for all your household needs. You’ll find it convenient for brewing tastier beverages and preparing cleaner meals.

The iFilters Water Filter is designed to enhance your home's water quality by filtering out sediment, dirt, and rust, ensuring that you enjoy cleaner and safer water. It effectively reduces chlorine taste and odour, making your drinking water more pleasant. By using this filter, you can extend the life of your washing machines and water heaters, saving you money on repairs and replacements. Its easy-to-use design features a 3/4" NPT port with a pressure relief button, simplifying filter changes for your convenience.

The BLUONICS Water Filter offers a reliable solution for purifying your home's water supply. It effectively reduces various impurities, including chlorine and rust, ensuring you enjoy clean, great-tasting water. This powerful filter works well with both municipal and well water, providing convenience for all users. With durable, heavy-duty housing, you can trust that this system is built to last while maintaining the water's natural taste and pH balance.

The PERCOLA Water Filter System offers an easy installation process with clear instructions, allowing you to set it up without professional help. Its 3-stage filtration effectively removes sediment, chlorine, and unpleasant odours, ensuring that you enjoy clean, fresh water throughout your home. Designed for high capacity, it can filter up to 100,000 gallons of water, providing you with long-lasting performance. The durable design ensures reliability, making it a great choice for maintaining your plumbing and appliances.

The Blue Aqua Water Filter is a highly efficient under-sink system designed to purify your drinking water. With its advanced 7-stage filtration process, it effectively removes 99% of contaminants, ensuring your water is safe and clean. The built-in booster pump allows the system to filter over 190 litres of water per day, meeting your household needs effortlessly. Installation is simple, and you can easily replace the filters, making maintenance hassle-free for you.