pelletized dolimite lime

[spacemyface]

I found some in the garage, can I use it?

[stinkyattic]

Personally I would stay away from the pelletized stuff because it will be harder to get mixed in very evenly, and as the pellets break up, the pH is going to change.
Why do you think you need lime? Are you running a peat moss based medium? Is your pH already acidic?

[the image reaper]

the Dolomite Lime I use is called "prilled" .. it's little pellets, probably what he is talking about ... and, that brings up MY question ... I've been using it for awhile, and it works great for bringing up my pH in my acid water, plus adds calcium and magnesium ... but, although it dissolves rapidly, it does leave a dark, fine-sand, a gritty residue in the jug ... almost black, l have assumed it is the magnesium ... any clue on that ??