I've been using this product for 3 months of full timing. The temperatures have been relatively low and so odor is not typically an issue this time of year. I've not had any issues with odor since beginning to use this product, but the next 3 months will bring the hot weather and I'll update this review if it becomes a problem. This product comes with a scoop. Directions call for 1 scoop per 30 gallons of tank capacity and state that product can be used in the grey and black tanks. I don't flush any paper products into my black tank so I can't speak to how well that paper is dissolved but I haven't noticed that this product is any better or worse at dissolving solid waste than other products I've tried. I like the powder, it's convenient to store and use. After I empty my black tank, I fill the toilet bowl with water, scoop in this product, swirl my toilet brush to dissolve all of the product and flush. My toilet brush stays nice and clean too. This is formaldehyde free which is required at a lot of campgrounds. I also think that this would be better for people who live in colder climates - this won't freeze and burst a container in colder climates like a liquid tank treatment could. I'm sure this could sit around for years and be just fine.
Addendum: After 3 months of constant use (emptying black tank twice weekly) I've noticed that the seals are drying out. I remedied this by adding some dawn dish soap to the black water tank along with the happy camper powder and that seems to have resolved the issue. Prior to this I utilized a liquid black water treatment and it had lubricants added. This product is powder only and you'll need to add something to protect your system from drying and cracking.Read More