I have a 25 gallon holding tank with this unit, does anyone know how many flushes in general it would take to fill this holding tank. We try our best to keep the pumps used each time to 3 or 4, for some reason the tank seems to fill quickly. I plan to eventually install a monitoring system to help me gauge how full the tank is, until then I need to estimate this to ensure it does not over flow.
Tom,
A very good resource is http://www.sailboatowners.com/forums/menunew.tpl?fno=31
To find out what is being pumped per stroke, measure a quantity of water, put it in an empty bowl and flush it out.