black tank
If you are on a site for months why is it not ok to open the black tank valve to stay open?
Forum Discussion
Drain pipes in your home are rigid and do not normally move. When installed they are set to a proper "slope" which is best to make sure the water does not "out run" the solids and the reason they are "open" all the time. Additionally, in a home drain system normally people tend to use more water.
In an RV situation water conservation is normally of high priority so less water is used. In an RV situation the drain is normally anything but with a proper slope from the holding tank to the hole in the ground. Additionally, an RV does not dump directly from point of use into a small pipe or hose. It first dumps into a large tank and then into a smaller pipe or hose.
Bottom line as others have mentioned water flow is used to move solids. When the liquid "out runs" the solids you eventually have "backup".
In an RV situation water conservation is normally of high priority so less water is used. In an RV situation the drain is normally anything but with a proper slope from the holding tank to the hole in the ground. Additionally, an RV does not dump directly from point of use into a small pipe or hose. It first dumps into a large tank and then into a smaller pipe or hose.
Bottom line as others have mentioned water flow is used to move solids. When the liquid "out runs" the solids you eventually have "backup".
