I have to insist that the key to dental hygiene is an electric toothbrush and using a Waterpik with a periodontal tip, augmented by flossing, hands down. My gum health issues, periodic bleeding gums, was corrected with these two devices. For myself, flossing alone is not adequate. IMO, it’s too much work to do it right. While using my Waterpik this morning, I noticed some brown gloppy material coming out of the junction where the water tube meets the hand held tool. It’s the kind of stuff reminiscent of what is sometimes seen in a whirl pool tub, when it has not been run in a while, Algie-like growth in the water jets. Sounds and looks disgusting. I use my Waterpik regularly, but sometimes skip a day. Of interest this brown material not was coming out the tip into my mouth, which made me wonder if the hand held tool has a filter, yet if a filter was clogged, why would anything be coming through the tip? Yet I don’t see a way to take it apart, and I looked online and the only cleaning instructions I found was how to clean a tip in vinegar, nothing about how to clean the internal guts of this machine or the hand held tool. I ran several tubs of water through the machine. Of note, I frequently use a 50-50 mixture of water and mouthwash in the Waterpik. Any thoughts on this? Anyone experience this? Is it time I purchase a new Waterpik?