I've tried about all the tank products out there and have come across the best product I've ever used, called "Happy Camper" found at some R.V. supply stores, but mostly in swap meets.
One scoop per 30 gallons will keep your tank and sensors clean with minimum if any smell. It works across the entire temp range also as most don't work when it gets hot. I also put some in my gray water tank every other time I dump. Soaps, food scraps etc. can smell almost as bad as black water. Also I put it in the trap of the sinks and shower dissolved in glass of water before I go to bed because it gives it a chance to clean out the traps as well. Try it, I think you'll like it. Dry product, environmentally safe and non caustic with no smell to it. It's not an odor eliminator, it's an odor remover.
Gene Nelson