Explaining The DC Algae Problem

 Basically....the science is....green algae or cyanobacteria grows exponentially when three main factors align.

Factors?

1.   Excess nutrients (especially nitrogen and phosphorus)....acting like fertilizer. Phosphorus is often the key limiting nutrient in freshwater systems.

2.  Sunlight....for photosynthesis and energy.  If you had 3 to  6 days of clouds....it would be slow in  appearing.

3.   Warm temperatures.....warmer speeds the process...cooler lessens the speed.

If you replaced the water hour by hour, or cooled it....algae would marginally appear.  If you 'flushed' it every twelve hours....that might help.

It's NOT rocket science.

Note: you could fool folks into believing that global warming triggers this, and most would readily buy into it.