A. O. Smith Drinking Water Filter

AOS Water Filters


The highest international standard for drinking water at 0.0001 micron filtration.

Reverse Osmosis water filters

AOS filters use Reverse Osmosis (RO), the top international standard for clean drinking water

RO filters up to 0.0001 microns. That’s three zeros. Most other filters only have the technology to filter up to 0.001 microns.

Singapore government uses Reverse Osmosis (RO)

PUB uses RO and ultraviolet (UV) to purify our water.

These are proven, internationally recognized methods for purification.

RO Water – #1 in USA and China

In places where water purification is essential, RO is always used as 0.0001µ filtration ensures that all trace heavy metals are removed.

RO is the top water purification system used in USA and China.

Filter replacement indicator

Light indicator at drinking water tap changes colour to reflect life of the filter, giving you ample time to arrange for filter replacements.

White/Green– Normal
Orange– 5% life
Red– 0% life

The filtration process

Isn’t water in Singapore already clean?

PUB purifies our drinking water, but water coming from our taps still has to flow through common water pipes and a water tank.

It is not compulsory to purify our water in Singapore but it is good practice to give the water we consume a final cleanse with a drinking filter.

Does water from PUB contain chlorine?

Yes. Chlorine is added to disinfect the water and kill germs as it travels from main water pipes, to water tanks and finally to our homes.

It is good to remove chlorine from the water we drink. You can do this with a carbon filter. Most drinking water filters in Singapore contain a carbon filter.

Is alkaline water the same as RO water?

These are two different subjects. If your objective of getting a drinking water filter is clean water, then the top international standard is reverse osmosis (RO) at 0.0001 microns.

If you want alkaline water, you need an ionizer. Most ionizers in Singapore do not have an RO filter.

Are the benefits of alkaline water proven?

Alkaline water claims to give health benefits of better skin, anti aging, immunity boosts and weight loss. However, the benefits of alkaline water have not been medically proven.

Should I get a hot and cold dispenser?

Having both a hot and cold dispenser is akin to having a mini fridge and water heater in the water purifier. These are the top two highest energy consumers in our household.

Hot and cold features are great for an office environment where there are over 15 users but it is a waste to consume so much energy for small families of 2 to 5. Go green, use only what you need!


Model AR-600 AR-75
RO water
(stage 3/4)

(stage 5)
Maintenance $160/year $200/year
Size (mm) 460 (W) x 488 (H) x 161 (D) 260 (W) x 420 (H) x 410 (D)
Power (W) 125 25
Voltage, Hz 220V, 50-60Hz 220V, 50-60Hz
Filtration rate 94 liters/hour 11.8 liters/hour
Water supply pressure (MPa) 0.10 – 0.35 0.10 – 0.35
Weight (kg) 13 11
Warranty 1 year 1 year