Product review (3 stars): Might want to use distilled water
I was glad I was able to find the filter on Amazon because I couldn't find them in any stores. I went to the Graco website but the filters were a bit more expensive directly through them. My only problem with the filters is how fast they seem to become discolored. I am currently using tap water which is obviously not the best idea. I knew I would go through the filters fairly quick based on past experience & other Amazon reviews, so I decided to buy 2 filters. Once the current filter is no longer useable I am going to try my luck with distilled water.

The reason I rated the filter 3 stars is just because it is an expensive filter considering how long it lasts if tap water is used. Although in all fairness, if there weren't so many impurities in the water I doubt the filter would go bad as quickly.