The filter can only hold so much contamination and when it reaches that limit it starts to dump them back into the water supply.
Thats why there is a recommended change time.
Geez don't cheap out on the water you drink.
What happens if water filter is not changed?
As your water filter begins to wear out, it will become less effective at filtering out the various chemicals, minerals, and microbes that may be present in the water supply. This may soon become apparent to you in the form of changes in the taste and odor of the water coming from your refrigerator.
What happens if you drink water from an old filter?
If you use an old filter, you risk drinking contaminated water. Studies have shown that old filters provide a conducive environment for the growth of biofilm which means the water will most likely be contaminated with bacteria.
