I just bought a Morebeer oxygenation set up and used it on my last porter. After using it I wanted to take it apart to clean it. There is a black hose attached to an air filter. I can not get the black hose off of the filter to clean and sanitize. I am about to cut it off. I have heard that filters are not necessary when using o2. Anyone out there have the same problem or any experience with not using a filter with pure o2?