Tadpoles, thousands of tadpoles!

Acquired a property with a swimming pool that is infested with tadpoles.

Pool is 25000 gallon in capacity, about 5' deep on one side and 9' deep on the other.  It has lots of tadpoles.  I couldn't find daddy and mommy frogs.

It's more a swamp then a pool at this point.

I think I need to drain the pool and acid wash it right?

Is there a humane way to do this?