What would be the consequences using ²Toilets in a major airport like Frankfurt / Main instead of regular toilets? We performed a calculation and gained amazing insights.

Calculation assumptions

Based on public passenger and visitor data, it can be assumed that the average number of passengers per day are around 170,000. Everyone can figure out that this implicates a rather frequent toilet use.

In our calculation example, we assumed 100,000 toilet flushes per day. This is a rather modest estimate of just 0.6 usages / person. Given the average length of stay of several hours at an airport, an approach of 1.5 - 1.8 uses / guest would be more realistic.

The average amount of water in a commercial toilet is around 9 liters per flush, the consumption of the ²Toilet is 2 liters per flush. The costs for one cubic meter of drinking water including canal fees are set by a major buyer at 3 Euro / m³ (as for Germany).


The 100,000 flushes result in a daily water consumption of 900,000 liters with conventional toilets and only 200,000 liters with 2 toilets. Extrapolated to the annual consumption we end up with 328,500 m³ compared to 73,000 m³ at the ²Toilet. This difference is a saving of 255,500 m³, ie more than 255 million liters of drinking water. And that's a very low-key estimation.

Considering the costs is equally memorable: The costs for drinking water consumption are reduced from just under one million Euros to € 0.22 million, which represents an annual saving of € 766,500. In contrast, the electricity costs incurred by the ²Toilet are negligible.

The savings resulting from lower personnel costs, less cleaning agents and facility personnel are a multiple of the water savings, as our research and calculations proof. If you are interested in this calculation, please contact us via the contact form.