On Sun, 07 May 2006 23:32:14 GMT, Peggie Hall
wrote:

krj wrote:

How many days will a 13 gallon tank last for 2 people before having pump
it out?


Here's the math you need to know about how long it will take to fill up
any size tank:

The average adult uses the toilet 5x/day...average flush is .6 gal. So
each person continuously aboard will put about 3 gal/day into the tank.

But if you had a Therford with a 5 gallon holding the average use per
flush is about 53 uses till full.