Planted Tank Guru
Join Date: Jun 2004
Location: Baton Rouge, LA
Mason jars also screw into the blade assembly on most, if not all, blenders. Good for grinding up coarser ferts into a finer and more homogenous blend. Spices too.
You can keep ferts in mason jars. No worries about the copper. I usually use those plastic containers from Crystal Light and similar drink mixes though. Good size, easy to spoon from, easy to open.