At this rate that's going to take awhile.

The water in the pipes, sitting static, concentrated the algae.
Once the valves were opened, the first several hundred gallons of water had loads of algae that hadn't had any exposure to oxygen (bad for algae).
Since it's not soluble, diffusion doesn't apply, so those concentrated colonies has a chance to bloom wildly.
The added temperature, of course, does matter.
But, the higher temperature could have been ameliorated by the addition of about a half-gallon of hypochlorite bleach while still in the pipes.
99+% of the algae would have been dead before it went into the pond. Simple filtration makes it a non-issue.
This was done very sloppily.

Warm, still water, with duck and goose poo for fertilizer = algae. It's been a problem ever since the pool was built, and just painting the damn thing blue didn't improve anything at all.

It requires treatments like those used in cooling towers.
Algae in a cooling tower is death to heat transfer system (causes bad fouling), so has to be controlled and it is, tge world over.

Green snacks...?
Green crackers...?
Algae green...?

It has a truthy ring to it.

They are hard to avoid in the DC downtown area - tidal pools, etc.

and be biglier!

Algae dies in dark pipes. I move my water for animals into underground storage during summer to prevent algae growth so rapid that it blooms immediately when I pump it into their troughs.

The brilliant pedo Trump administration pumped the new water from an open water source with algae already in it. (Perhaps the Potomac or Anacostia rivers?) And it merely grew and thrived in the extra heat.

Most algae will die in about 7 days in the dark. Some very hardy types of algae will take about 2 weeks to die. But algae does not grow or survive in dark pipes. The pool was empty for about 6 weeks. Long enough to kill most all algae.

They should consider covering it with a black out tarp. That will kill it in about 2 weeks. Though I can't imagine a blackout tarp that big.

Also a salt pool would be more environmentally safe than all the chemicals they are pouring into the pool.

This is what happens when scientists are removed from the equation.

the algae would come back. And some kinds of algae grow in salt water. There's no getting rid of algae permanently as long as you have un-aerated warm water, and you can't aerate a reflection pool if you want it to reflect.

I did have a little stream with a fish pond in my back yard at one time. The algae was a problem.

If people just respected President Trump like they should that algae never would have grown!

It won't be a reflecting pool any longer. Thanks, T****.

I thought it was from "something" else.
After all, he IS right-handed!

Have they tried Ivermectin yet?

Slow-release algae capsules, to spoil trump's birthday?

then you can go look at your beautiful self any time you want.