Residual chlorine, Singapore tap water and your shower

Singapore's tap water carries some residual chlorine on purpose. PUB, the national water agency, disinfects water with chlorine during treatment and supplies it with residual chlorine in the form of monochloramine, to protect the water as it travels through the pipes to your home. PUB says the water is safe to drink straight from the tap.

A shower filter is a separate choice, about how a shower feels. Some people simply prefer how their shower feels or smells with a filter in place, and that preference is the whole case for one. This article sets out what PUB says, in its own words where we can, and then what the SEASEE head filter is designed to do.

Why treated water carries a residual

Water does not go straight from a reservoir to your tap. PUB describes the journey in steps. Raw water is carried by pipelines to the waterworks, where it is chemically treated, filtered and disinfected. PUB says it uses chlorine to disinfect water during that treatment process.

Then comes the step that matters for your shower. In PUB's words, "Ammonia is added to the treated water to form chloramines, a more stable chlorine residual." That residual is deliberate. PUB explains that it supplies water "with residual chlorine in the form of monochloramine to protect the water as it is conveyed through the water distribution network."

In other words, the residual is part of how the water stays protected on its long trip through the network. PUB states the consequence plainly: "There will therefore be some residual chlorine in our tap water."

What PUB says about drinking it

PUB is clear on this point, and we think it is worth quoting in full:

• "Our tap water is suitable for drinking directly from the tap without any further filtration."
• "Tap water in Singapore is safe to drink, and there is no need for any point-of-use water treatment or filtering devices to further treat the water."

We agree with all of it. Singapore's tap water is safe to drink, and it needs no filtering for drinking. A SEASEE shower filter answers a different, smaller question: how you like your shower to feel. It is a comfort choice about the shower, and it has nothing to do with whether the water is fit to drink. If you drink from the tap today, carry on.

So why filter a shower at all?

Because a shower is not only about water quality. It is a few minutes of your day, and people have preferences about how it feels: the temperature, the pressure, the shower head in their hand, the scent of the soap. For some people, a filter in place is one more of those preferences.

That is a preference, in the same way that some people prefer a particular kettle or a particular towel. It is not a correction to the water, and it is not a promise of any result. We would rather you bought a SEASEE shower because you like the routine than because anyone made you worry about the tap.

What the head filter is designed to do

The SEASEE head filter is a disc 6.5 cm across and 2 cm thick that sits behind the spray plate of the Basic and Premium shower kits. Of its five layers, two come up in a conversation about chlorine: an activated carbon filter, described here by its material, and a chlorine-reduction ball layer, which is designed to help reduce residual chlorine. Inside the five-layer head filter goes through all five layers.

Working with the sediment body filter in the handle, the head filter is designed to help hold back sediment and reduce residual chlorine before water leaves the shower head. How much any filter does depends on the water going in, how much it is used and how long it has been in place, so we describe the layers rather than publish figures.

Keeping it fresh

As a guide, change the head filter about every 2 months and the sediment body filter about every 2 to 4 weeks. Timing varies with local water conditions and how often the shower is used. Change either one sooner if it looks dark or the water pressure drops noticeably.

The full schedule, and how to change each filter, is in How often should you change your shower filter?. If you would rather not keep count, single refills can go on the Refill Plan. The Basic and Premium kits are on the shower collection.

The short version

Singapore's tap water carries some residual chlorine by design, and PUB says it is safe to drink from the tap. A shower filter is a comfort choice for people who prefer how their shower feels with one. The SEASEE head filter is designed to help reduce residual chlorine, so keep it fresh and change it on time.

Sources

PUB, Singapore's national water agency. Each sentence below is quoted from the page listed, as read on 8 October 2026.

• PUB, Water Quality, https://www.pub.gov.sg/Public/WaterLoop/Water-Quality
  • "Our tap water is suitable for drinking directly from the tap without any further filtration."
• PUB, Water Treatment, https://www.pub.gov.sg/Public/WaterLoop/Water-Treatment
  • "Raw water from various sources is conveyed by pipelines to the waterworks where it is chemically treated, filtered and disinfected."
  • "Ammonia is added to the treated water to form chloramines, a more stable chlorine residual."
• PUB, Clarifications ("Online content containing misleading claims on quality of Singapore's tap water"), https://www.pub.gov.sg/Resources/News-Room/Clarifications
  • "Tap water in Singapore is safe to drink, and there is no need for any point-of-use water treatment or filtering devices to further treat the water."
  • "PUB uses chlorine to disinfect water during the treatment process, and supplies water with residual chlorine in the form of monochloramine to protect the water as it is conveyed through the water distribution network."
  • "There will therefore be some residual chlorine in our tap water."