Biological purification
The most environmentally friendly. Bacteria purify water up to 99%. The treated water can be drained back. 1,500-3,000 EUR.
Vacuum toilets
0.5-1 liter of water for rinsing. The tank is emptied every 2-4 weeks. Popular in floating houses.
How to choose?
In a lake with high ecological value - biological. If shore connection - pump. Vacuum - minimal water consumption.
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