A pond is not a jug of water, with or without BS...
The buffering solution in the jug still has to deal with whatever is in the pond trying to take things in a completely different direction. BS, or what ever other product anyone may use, still has to deal with the fact that in the pond there is competition for dominance.
Example A, freshly built concrete pond. Not fully acid washed and sealed. Source water ph 7.0, pond water ph 24 hrs after filling 11.5 due to leaching lime from the concrete. A 400 ppm BS solution would drive the ph down
toward 8.4, but the lime is still there trying to drive it up again so you never get to 8.4 until the lime is leached out and the concrete is aged. Doing it this way is gonna take a LONG time...
Example B. Green water pond with ph swings from 7.5 at daybreak to 9.5 about 1 hr before sunset. The same 400 ppm BS dosage would probably bring the 2 point swing down to a more tolerable 1 point drift of 8.0 - 9.0, but you still aren't stable at 8.4 or anywhere else.
Bottom line is no silver bullet. BS is a great bandaid in an emergency with predictable results, but if the pond has a problem then the problem still has to be fixed to make things right.
But BS is still a great way to test your ph tester
