Product review (4 stars): Good filter
I replaced the one in our fridge. The old one was about four years old. I don't know about the three month recommendation. Reminds me of the three thousand mile oil change, that experts will tell you aren't necessary as they recommend five thousand miles. But, they want to sell filters, and they will go broke waiting for me to buy one every four years. I did find that it works exactly like a water filter. Amazing isn't it.