These should come with 3x the amount of the cotton layer!! This part needs to be changed 2-3x more often then the filter! Why are they not available to buy separately??!!! I came here looking to buy some of them extra, as need to change more often than the filter part, due to it changing colors within a few days after I had set it up and changed it like within 3-4 days after set up! Is there a way to get these ordered in a batch of 10 or 20? I use distilled water for my cat, or drinking water, both bought by the gallon at store. He won't drink the faucet water.
