Replaced 3" Black Tank Gate Valve

[Invizatu]

Jim:
I have heard a lot of positive, swear-by-it postings on the internet for Happy Camper tank additive. I truly do not know how well it digests paper, but I believe I had a little of the same problem you had with the cap area leakage which seems to be gone. The tank odors are definitely gone. I'm still early in my evaluation of this product, but so far it seems pretty good.
I don't know of any stores that sell it, but they have their own websites, and you can also get it through Amazon. Amazon usually has free shipping.

We just started using "Happy Camper" also (about 4 weeks now). We had odor issues that seemed to be recurring. I spoke with several people that use it and they swore by it. It took a couple of cycles...filled and emptied and a good black water flushing, but now all seems good. We use it in both grey and the black tanks. So far / so happy.