Saving water due to a Waterless Composting Toilet.
A family of 3 persons per year uses 30 m3 to 40 m3 of water for the toilet.
The toilet uses about 40 % of the water. The water saving in 15 years is 600.000 liters. The financial saving is around € 2200.
Savings on Maintenance
Cleaning septic tank: if at 15 years 5 purifications are made to 125 € per cleaning, the cost is 625 €
Unblocking: Average use of unblockers, technical intervention for repair or unblocking: minimum 200 € per 15 years
Total profits 15 years: € 2,925. (At 40 m3 of water: the profit amounts to 3000 euro.)
Electricity Cost over 15 years: 1.900 €.
Net profit: € 1.025.
In the longer term, water is a scarce and precious commodity. The likelihood that prices or environmental requirements will further increase is significant.
Extra Benefits when Building a New House
When building a new house you could consider to foresee no infrastructure for a water-based toilet.
This allows to avoid many investments:
- Water pipes to the toilets
- Septic tank and overflow into the sewer
Extra Benefits in Existing Buildings
- If you have no access to water in the part of the building where you want to put the toilet, costs are high for making water available
- The proper functioning the septic tank and the overflow of the sewer must be OK and compliant with modern regulations.
Living in a Nature Protected Area ?
You cannot install a septic tank. You will have to provide your own water cleaning system. By installing a composting toilet, 40 % of the normal water use is avoided and does not have to be cleaned. The remaining 60 % is easier to clean (e.g. by using ecological washing products).