Rid-X

I will give it a try. Our RV is hooked to a septic tank that we share with another seasonal. They use very little water in their black tank. I was hoping that the rid-x would help with cleaning my tank, plus work on all the "solids" my neibghors send out. As for price, it's $6.97 for a box that treats 1500 gallons. That's $.21 a tank.