Thread: Use of alum block

Or worse yet had one start leaking grit out a hole on the side as it lost its internal integrity. Har! I tried water melting a couple to smooth them out with no luck. It does not fuse back together or fill in the cracks they just get deeper.

The consistency vary considerably between brands. Some seem one solid crystal block others seem to be a conglomerate of chunks to a conglomerate of sand. I think the solid crystal blocks seem to do a lighter application where the courser blocks is heavier. Let it sit wet for a few seconds and it seems like a heavier application, a thicker slurry of alum & water. Hot water seems to dissolve quicker than cold water.

Or have I overt thought this? Har!!

I prefer the smoother blocks and have trashed a couple that got rough surfaced or crumbly.