Without actually testing the water, my gut feeling is that you'll never notice the change in pH. The amount of dye that goes in a pond is so insignificant compared to the whole volume of water in the pond that I doubt you'd see a change.

A little goes a LONG ways!!

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).