Thumb Down Flourite
I bought a bag of red Flourite and found out that is is very dirty, I mean very dirty! And I donot see the justification for the price and doubt it benifits, despite of many people here claim otherwise. Here is why.
1. It is just crushed shale and slate, both are mud stone, with the latter under higher pressure in the sidimentation process so it is harder and more stable, and basically inert and no benificial to plants.
2. The shale may have some benifits to plants, it is basically dried mud. But it will slowly dissolve in water, and that is why it is so dirty. You will be better off by using regular gravel plus some dirt from your back yard. It is a lot cheaper.
3. It is too coarse, up to 1/4 inch in size, and too sharply angled, not good to the root.
4. There is no special treatment to the crushed rock, no additional added benifit, no justification for the high cost.
The Floramax is basically the same materials, but crushed and graded to a much finer size, and is much cheaper. IMHO, it is much better value.
Other than AS that is specially manufactured substrate for planted tank, all the crushed rock should be treated the same, crushed rock. And they are no better than natural gravle and sand. One exception is crushed and properly graded lava rock. Their porosity has been proven to be benifitial.
Anyway, Flourite is crushed slate and shale, poorly graded, dirty, and over priced, ordinary substrate, no better than any properly graded oridinary gravel and sand.