Visiting one of the wastewater treatment plants in the Shomron, designed by one of my distinguished Israeli water engineer colleges, I was astonished by this settling tank covered by a thick layer of green algae. The fellow forgot to provide an overflow feature to clean the floatsam, and it accumulates and developes in the surface. The layer creates an oxygenated layer immediately below and then a dark anaerobic depth of water. I¨ll have to think something to remedy the situation.
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