This is the most common question that homeowners ask about their storage tank. The answer: it depends on the type of toilet you are going to use. First of all, you need to know how much waste an adult produces.

Field experience shows us that, on average, an adult generates a total of 2.6 liters of waste per day, and flushes the toilet about five times a day.

This means that an adult generates 0.53 liters of waste for each flush of the toilet.

Next, we will need to add the amount of water used in each flush to the amount of residue per flush. This is where the type of toilet used becomes very important.

A A manual or electric toilet can use up to 3.8 liters of water per flush. If your boat is equipped with these toilets, the total amount of effluent in each flush would add up to 4.3 liters.

A Sealand VacuFlush® toilet will, on average, use just 0.76 litres of water per flush*. This reduces the total effluent per flush to 1.29 litres. Based on this information, we can easily calculate the number of flushes a given storage tank will be able to handle.

VacuFlush® toilets are capable of operating with just 0.49 litres of water per flush. Since we recommend using more water when rinsing solids, we have maintained this average water consumption value of 0.76 litres per flush.

The numbers prove it: a VacuFlush toilet can significantly increase the interval between tank pumping, compared to other manual and electric toilet systems.