parkmanaa wrote:
Another thing you might consider. All black water MUST be held until the tank is full, then dump at one time. While it is customary for RVers to leave the gray water valve open all the time, you could also close this one and dump all at one time.
Then, set a time of night when your house usage is minimal and dump both tanks.
Thru my experience of living with septic systems in the past, I believe this may be a viable solution.
Dumping a large volume into a septic system is not a good idea as it stirs the tank contents and flushes some solids out into the drain field.
Possibly the op can contact the local health dept and have them ok putting in a 500 to 1000 gallon holding tank (no field) and then have it pumped as needed.
