i live in "chalk" (kaolin) country---the chalk mines use a product that settles chalk/etc to the bottom (research flocculants? sp) --it too is really slick---not sure if it's the same as db100 or db200--sounds like it but that is really just a guess. still i'm not sure how well any of that will maintain over the years--- if you're looking for long lasting results-- i plan on trying some of the db200 but i also plan on most of my fix to be proven such as good clay. i would welcome any news of a good reasonably priced fix... look forward to some success stories!!