<a href=showthread.php?s=&postid=11636189#post11636189 target=_blank>Originally posted</a> by Bandsaw
I was thinking more on the line of bulk sources of dolomite. Similar to Magflake and Dowflake.
I figure the popularity of using Mag and Dow for Calcium and Magnesium for fraction of the cost of using aquarium pharmaceuticals products has got those pharmaceutical companies red mad, I figured there has to be a viable cheap source of dolomite somewhere even if you need to do your own crushing.
Nah... most of the industry companies selling addiives don't make much money from them. Most will eventually just stop making them if the sales drop too low to justify continued production, which will vary from company to company. take some of the big boys for example, like Aquarium Pharm (API) or Kent Marine. Aquarium Pharm is owned by M&M/Mars. If they stop selling additives for saltwater aquariums, the companies officers probably wont even notice. Now, if we stop buying M&M's.....that may get their attention

Kent Marine, basically same story. owned by Central garden, the marine additives business is a fraction of 1% of their business. There are some small manufacturers that would probably be hurt by everyone going "bulk". Companies like ESV, etc.
All that being said, if you find a source for the dolomite, let us know. I have been looking for a while now. i can't even find it in pet stores anymore and don't want to pay $24US for a 1L bottle of ZeoMag.