Just a warning stick with granular gypsum and only apply it if it appears visually white.

I bought some pellitized gypsum instead of the granular and broadcast it from a boat. I then noticed that my water was brown. I called up the company and the binder they use to make it dissolved quickly in water has a brown color. They are called Lignosulfates and are made by treating the wood by product ligin with sulfur compounds.

It looked brown in the bag but I thought it was just because it was made into pellets. Live and learn.

Needless to say I am not happy. I am posting to prevent you from suffering from the same problem.

Anyone know how long the lignosulfate take to break down. Anything I can do at this point?