Santa Monica
The treatment plant of the city of Santa Monica project is an anaerobic percolator filter.
It has a total waste water treatment capacity of 4000 houses, corresponding to 20000 people when its entire installation will be completed.
The plant will be built in 22 modules in parallel. Each module has two lines, calculated for 175 houses, or 875 inhabitants in total.
It does not need electric motors, because it enjoys the slope so that the waste water enters the plant and leaves treated by gravity.