How Does an Under Sink Water Filter Work to Purify Tap Water in Singapore?

How Does an Under Sink Water Filter Work to Purify Tap Water in Singapore?
3 min read
13 July 2023

Access to clean and safe drinking water is essential for maintaining good health. In Singapore, where tap water is generally safe for consumption, some residents opt for additional filtration systems to further enhance the quality of their water.

Among the popular options is the under-sink water filter, which effectively removes impurities and ensures a fresh and purified water supply right at the kitchen sink. In this article, we will delve into the working mechanism of under-sink water filters in Singapore and how they purify tap water.

What is an Under Sink Water Filter?

Under-sink water filters are compact filtration systems designed to be installed beneath the kitchen sink. They provide a convenient and efficient way to purify tap water, ensuring that you have access to clean drinking water for cooking, drinking, and other household needs.

Filtration Process:

Under-sink water filters employ multiple stages of filtration to remove various contaminants present in tap water. Here's an overview of the typical filtration process:


Before the water reaches the main filtration system, it passes through a pre-filter. This pre-filter is responsible for capturing larger sediment particles, such as sand, silt, and rust. By removing these visible impurities, the pre-filter helps prolong the lifespan of the subsequent filter stages.

Carbon Filtration:

The primary filtration stage in under-sink water filters is usually activated carbon filtration. Activated carbon, treated with oxygen, creates a highly porous structure capable of trapping and adsorbing a wide range of impurities.

This includes chlorine, volatile organic compounds (VOCs), pesticides, herbicides, and certain heavy metals like lead and mercury. Activated carbon also helps eliminate unpleasant odors and tastes from the water.

Reverse Osmosis (Optional):

Some under sink water filter in Singapore include an additional reverse osmosis (RO) membrane stage. Reverse osmosis is a highly effective filtration process that uses a semi-permeable membrane to remove microscopic impurities.

It can eliminate contaminants such as dissolved salts, bacteria, viruses, and even some radioactive elements. The inclusion of an RO membrane provides an extra layer of purification, ensuring the highest quality water output.


After the water has undergone the main filtration stages, it may pass through a post-filter to further polish the water quality. This stage helps capture any remaining particles, fine sediment, or activated carbon fines that might have passed through the earlier filtration stages. The post-filter ensures that the water leaving the under-sink filter is crystal clear and free from any residual impurities.

Maintenance and Longevity:

To maintain optimal performance, regular maintenance is necessary for under-sink water filters. This typically involves replacing the filters at recommended intervals, which can vary depending on the specific model and usage. Routine filter replacements ensure that the filtration system continues to deliver purified water consistently.


Under-sink water filters play a crucial role in enhancing the quality of tap water in Singapore. By employing a combination of pre-filtration, activated carbon filtration, and potentially reverse osmosis, these systems effectively remove various contaminants, including chlorine, sediment, heavy metals, and organic compounds. Understanding how under-sink water filters work can help residents make informed decisions when it comes to ensuring safe and purified drinking water at home.

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Amglow 3
The Amglow Water Filter offers a water filter system that removes chlorine, fluoride, and heavy metals from water. Its pH levels are increased to above 8 with t...
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