MySuncoastRV wrote:
Mike is correct on this one. Never leave the valve open allowing it to flush directly into the slinky! Long term this will create a huge blockage in your tank. The tissue paper will remain in the tank where it will develope into a tepee shaped mountain with almost cast like strength. Keeping the valve shut allows for the tissue paper to dissolve properly. By opening the valve when the tank is full the paper will be pushed out by the fluid pressure.
While I agree with what you say. The OP is not talking about leaving his tank open. He is talking about removing his black tank completely. So there would be no build up.