Some said they were hearing to much. I commented that my problem did not start until a bad medical situation. I had tried every method to keep it working correctly and still had problems. I learned 2 things I had to do. One the product I was using had been in freezing weather. Found this seemed to kill the good bacteria. One individual stated he couldn't stand having the paper in a can. The can I got at walmart uses odor control bags and the lid seals. You do not see the paper, or smell it at all. I did what solved the problems and only shared if I could help someone. I no longer have pyramids. By the way. Ive always used plenty of water.