Very glad I purchased from this seller, excellent service and communication. I had been meaning to purchase a German crock pot for some time now as my attempts at fermentation in jars etc have often ended in the contents being thrown into the garden waste bin. My first batch of fermented sauerkraut/kimchi mix in my new Crock Pot have exceeded my expectation and I feel the quality is excellent as my sensitive digestion is not giving me any problems at all. I did add some veggie probiotic bacteria mix in capsules that had a variety of bacteria in it and I feel this has not only added to the quality but speeded up the fermentation process. Before using the pot I made sure to simmer the clay stones in water/vinegar, then leave in the oven for half hour and then leave to cool down slowly, so I had no mould problem at all and started my second batch as soon as I emptied my first fermented batch out of the pot. This food is now my absolute staple, I eat it morning, noon and evening.