There was a time when you had to filter water and then pour it into the ice trays and fill up bottles and keep it for cooling. However, now there are inbuilt filters that can disperse water and ice after filtering. Most refrigerators now days have these filters. At first they filter the water and then convert it into ice and some are kept aside to disperse as water.
These filters have made the whole thing pretty easy, different refrigerators have different kinds of filters with different capacity and the brands also differ. The best thing about these filters is that you need not fit any additional appliance for filtering the water. You will get chilled filtered water directly from your fridge. Thus it saves power, energy and money.
Refrigerator water filter is not available in every fridge. So if you wish to have one then you can get it installed into your normal fridge. No matter what kind of filter it is after a certain time it may have to be replaced because it starts to lose its filtering properties. You will sense the difference in taste and quality of water if the filter stops working. Some refrigerators also have sensors that will automatically alert you about the filters when it stops functioning.
When it comes to replacing them you can find some good quality filters online. There are certain online stores that sell filters along with other refrigerator parts. You can check out their online catalogue to see the filter that will be compatible with your fridge. Once you find it you can order it directly and they will deliver it to you.
As for installation most refrigerator filters are easy to install and you will be able to do it by yourself. For reference you can check out the catalogue of your fridge as you will find details about installation their or you can check out the website of the brand they usually have instruction there. As per the amount it depends upon the filter you buy but most online shops provides filters for much cheaper rates than that in the market.