How Do Water Filters Work and When Should You Change Them?

Water Filters are invaluable when it comes to giving you clean and safe water to use, but how would you know if they can’t do their job anymore?

Water filters come in different types and sizes, that can fit every household’s needs. Each water filter can provide you with the maximum filtering technology when in the right condition. However, many of you might ask

How often should you change your water filter cartridges?

Generally, replacing water filters depend on its usage.

If you live alone, then you probably have the maximum life span of every cartridge, which is 1 year.

If you live with your family (up to five), you will find your household may use more water than average.

How often you change water filter cartridges depends largely on water quality and the frequency of water use.

My Water Filter products use different filtering systems specifically for showers, tap water and even for the whole house. This way, you are guaranteed to enjoy clean and safe water for you and your family.

The Way Water Filters Work

The technology behind water filters is simple- it acts as a physical blockade that traps unwanted particles in your water. However, water comes from different sources which means different particles could be present. To effectively eliminate different waterborne contaminants that may cause illness, various water filter technologies have been developed.

  • Activated Carbon

‘Activated Carbon’ works by absorbing contaminants trapped inside the pore structure of the carbon filter. There are two types of this filter, the ‘Carbon Block’ and the ‘Granulated Activated Carbon’ filter where both are dependent on water pressure.

The Purity Series Water Filters from My Water Filter utilises both types. Generally included in one of several stages of water filtration in most systems, which functions to remove chlorine, taste and odour in your drinking water. However, it cannot filter inorganic pollutants like fluoride, arsenic and nitrate.


  • Reverse Osmosis

This water filter system contains more advanced technology than the ‘Activated Carbon’ because it can remove fluoride, arsenic and nitrate. Thus, these types of filters are recommended for people who want to remove fluoride or may have an illness. The Purity Series 3 Water Filter from My Water Filter undergoes 5 stages of purification where reverse osmosis is part of it.



  • Ultra Violet

This water filter technology kills unseen bacteria. The Purity Series 4 Under Sink and Purity Series 5UV Whole House Water Filters have this technology where each UV light can last 1 year.



Changing Water Filters

So FINALLY the answer to the question you keep asking when should you change water filters cartridges. For cheap low-quality water filters you may need to change them every 4-6 months. For the My Water Filter Products, it is recommended to only change them every 12 months for moderate use.

However, water quality and source can influence the filtering function of your filter. If you notice any of these signs then it’s time to change your water filters. A slight change in your water filter’s performance may be:

  • Change in Water pressure
  • Your drinking water tastes differently
  • You notice tiny particles present in your water
  • Water smells differently

If you see any of these signs then it is time to check on your water filter. One great thing about My Water Filter Products is, they provide friendly reminders if you need to replace your filters. This is an extended customer service based on the customer’s purchase history. You may call the service hotline at 1800 769 300 and you can have your next filter cartridge delivered straight to your home.



  1. Derek Sharpie

    thanks for your post!
    now i know when to change our water filter at home and how it works for us. keep posting useful information

    1. Andrew Whannell

      Thanks Derek. We appreciate your comments 🙂

      1. Hannah Tess

        i just want to know your perspective about reverse osmosis water home systems..thanks 🙂

        1. Admin

          Hey Hannah,

          Reverse Osmosis systems are the best water filtration systems on the market. They provide the highest filtration due to the fine membrane they use to filter water so if you want clean water, you can’t go wrong with Reverse Osmosis.


  2. Simba Sharma

    I doubt if India has such big Plants for water purification.
    We have Hard Water In our region in India, and the water otherwise tastes little different. Hard water needs Specialised water purification.

    1. Rodney Archdall

      Hi Samba, thanks for sharing. Yes, hard water does require specialised water purification equipment. Some people use water softeners, salt and chemicals. We prefer more of a natural water filtration process where there is no maintenance or electricity required. We have Australia’s widest selection of descalers in the country. What do you use to treat your hard water? If you have an interest for what we use, let us know.

  3. Simba Sharma

    Also the Hard water Problems are altogether different. The constant deposit of salt an minerals is a cleaning challenge.

  4. Mujeeb Rahman

    Hi is there any photo of the filter when its getting to change like in a big catering company or hotels?

    1. Rodney Archdall

      Hi Mujeeb, unfortunately we don’t have any pictures or changing a water filter in a big catering company or hotel.

  5. Sam Jones

    That’s a gross pic there, Andrew. I would never allow myself to take even a drop of that water. It’s catchy though! Hmm.. I knew that water filters should be replaced periodically or every 6 months, or even when the water you get from the system is already cloudy, but knowing about a 12-month capability is just wow. I’m not sure how it costs or if it would be cheaper than the regular brands, so I guess I have to check on that too. By the way, cheers for a great blog!

    1. Rodney Archdall

      Thanks Sam for your feedback. Different water filters have different cartridge replacement periods so always check with the person you are buying from and they will let you know.

      Have a great day!

  6. Gregory Willard

    I think it’s interesting that if you live alone, you should change your filter every year. My neighbors have a filter for their tap water, and they use it all the time. I will have to ask them when they change it.

    1. Andrew Whannell

      We agree, you should definitely change your filter every year as over time bacteria can build up in a filter if it is not changed.

  7. Alan Chapman

    Great article indeed! Thanks for posting this one. You did a great job and keep it up. I’ll bookmark this page.

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