Walex Porta-Pak Premium RV Toilet Treatment Drop-Ins, Treats Black Holding Tank, 10-Pack, Clean Linen

I've used this product from this maker for almost three years. I've dabbled with other brands and formats, but keep coming back to these. They do exactly what they are designed to do and all that's required of you is to remember to drop them in the tank after you empty and spray. It is said that the envelopes will foul your sensors in the black tank and I cannot speak to this because of two things. First, my sensors were iffy from day one on a brand new unit and second, because I open them and pour the powder into the bowl, the envelope goes into the trash. I have a toilet paper stand and hang a pair of precision scissors (the little ones that are just a little larger than nail scissors) on the end of the rod that holds the roll you're using, so I don't have to go look for scissors every time. I also approve of the fragrance, even though it's mostly irrelevant once you've dropped it into a black tank. I just don't like anything toilet-related to smell like a food item; citrus, cinnamon, mint, etc. It's really kind of gross when you think about it. THESE WORK. I live alone, so my tank only gets emptied once a week and I have never had any sort of issue while using these pods and for me, one is all that is required, ymmv. Excellent product.

These drop-in pods are super easy to use and smell great! No issues with RV potty smell or clogs of any kind. Awesome product!