I've bounced around on this issue. Years ago I had a travel trailer on my property in the Missouri Ozarks that I used as a cabin. Didn't know anything about campers back then. A friend said to put some chemical in the tank & I did until I ran out, and didn't want to go into town for just that. I never got any more, as I didn't notice a problem. When we got our 5th wheel I still didn't use any, but noticed that when I dumped the tank, there were solids coming out & undissolved TP, even using the recommend type. Got to wondering if I should start using something, & heard about a product called Unique. I use it all the time now, & it's GREAT! Now when I dump the tank, all that comes out is brown liquid, and I don't see any TP pieces. I've even gotten to where I use the same TP that we use in the sticks & bricks. There aren't many places that I've seen that sell it, but you can order it from Unique directly (
LINK) or get it on Amazon. It costs around $12.00-$13.00 for 32 oz. in an RV store, but Amazon has it a little cheaper. The first time you use it, & each time you flush the tank, you put in 4oz, and every time you dump it takes 2 oz. Now I buy it by the gallon, so I've always got it on hand.