GW3 Undersink Water Filter Replacement


Continue to have fresh & clean water with a replacement Glacier GW3 undersink water filter which is ideal for 1-2 households or for fridge freezers.

Plumbed inline compactly underneath the sink, this 4 stage water filter is installed with a separate chrome plated stylish tap. The water filter removes harmful contaminants such as chlorine, pesticides, herbicides and heavy metals from your drinking water.

The Glacier GW3 Undersink Water Filter Replacement has just been updated. No photos just yet. Same connections. New model will be sent for all orders.

Click an option below to buy online.


Key Features of the Glacier GW3 Undersink Water Filter Replacement

  • Our most compact unit.
  • Ideal for 1-2 person households.
  • Better for the environment.
  • Up to 2 years of fresh, clean water.
  • Installed directly on the water line to a separate tap on the side of the sink.
  • Extensive 4 stage undersink water filter.
  • Installs inline for American Style Fridge Freezers, no need for small 6 month water filters.

Get your water filter replacement from Glacier Water Systems, Ballymena.

Installation of My Replacement GW3 Under Sink Water Filter

  • If your current water filter has plastic fittings, your replacement has simple push, quick-connect fittings that allow a seamless replacement process.
  • If you are a previous NSA water filter customer or your current GW3 water filter has brass compression fittings, please ensure you select this option in the drop down. 
  • Our replacement water filters are compatible with many other water filter brands.
  • All our water filter replacement orders are dispatched with full DIY instructions.

FAQs on Replacing Your Water Filter

Why do I need to change my water filter?

Like any type of filter (car, air, oil etc), they eventually clog and stop working – they need to be replaced to maintain optimal performance.

The GW3 water filter is installed to remove chemicals and impurities. Those chemicals and impurities are absorbed into the carbon in the water filter. After approximately 2 years, the water filter will be saturated with those contaminants. Although water will still come through your tap, there is a substantial risk of leaking chemicals and bacteria back into your drinking water.

My water is ‘clean’, why do I need to change my water filter?

The question is less to do with the quality of the water or how “clean” it is – your water filter also filters out dirt, sand, sediment which will eventually clog your water filter.

I can’t taste the chemicals coming through my water filter, does it still need changed after 2 years?

Just because you can’t taste the likes of chlorine and heavy metals in your water doesn’t mean it is ok to drink. We also recommend the GW3 under sink water filter is replaced after 2 years because bacteria will have started to grow and it will be leaking into your water.

Is this just a money making thing?

The amount of filtration that your water filter can do is based on volume of water, science and number of people in a household, not £s. The GW3 water filter has the capacity to filter approximately 12,000 litres of mains water, which an average small household will use generally within 2 years, or on an american style fridge freezer. Glacier GW3 Undersink Water Filter Replacement.

Changing your inline Glacier GW3 water filter is much more cost effective than spending money on cartridges that need changed every month or every 6 months. This Glacier GW3 Undersink Water Filter Replacement is compatable with most other brands that need to be replaced every 6 months and for fridges with a water suppply.

Filtered water for all the family for only 20p per day

Replacement after 2 years £135
That is only £67.50 per year
£5.63 per month
£1.40 per week
Clean, fresh, filtered water for only £0.20 per day

My water flow from my water filter is slow, does this mean I need to change the water filter?

Yes this could be because your water filter needs changed. This will happen over time as your water filter will clog with sand, dirt, bacteria, chlorine and other contaminants. 

Continue to have:

Filter your water with Glacier Water Systems for great tasting water. Filter your water with Glacier Water Systems for a healthier you. Filter your water with Glacier Water Systems for fresher cooking. Filter your water with Glacier Water Systems for tasty hot drinks.


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