Op here I actually don't buy the kcups I buy regular coffee and a pod with a washable filter...both cheaper and environmentally friendly. And the keurig was given to me so never actually bought the machine and I never read up on the maintenance instructions like I should've, which I acknowledge is my fault. But I put milk and sugar in my coffee so it never actually tasted bad to me. And the whole machine is black so I couldn't see the mold growing in it. But we've since took the keurig apart (literally) and thoroughly washed and sanitized it and we installed a water filter on it.