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yung's avatar

We spent $14 Million to clean up the Reflection Pool in DC' National Mall for celebration of 250 on July 4, 2026. It turned green in a week. The pool was built to echo the water mirrors of Versailles to reflect, not to clean. May want to think twice about the filtration plan for your pond next year. In a way, the pond is a border separating inside and outside, and entropy will increase with time ---reaching a tipping point sooner or later.

Micha van Amsterdam's avatar

About the Reflection Pool: what a fitting example. A pond designed from the beginning to be a static thing. The algae: the unintentional emergent property that was never part of the original map.

Actually, if it weren't for the ducks, the load of excess nutrients would be light enough that the water plants could hold the balance themselves, no filter needed. The pond would settle into a sort of fluctuating equilibrium, far easier to maintain. But you are right of course: the filter is a boundary, an interface, and my intervention will always be required, to keep the scale from shifting too far toward entropy.

Brian's avatar

I have read that the pool was refilled with water from the Potomac River - the same river that had a major sewage line break in the spring and the sewage emptied straight into it. Repairs took weeks. Even if this happened downstream from the water intake for the pool, the river had many such problems.