It is all natural, environmentally friendly, and does not contain colouring. help water stay at neutral pH to slightly acidic. It is functional as water filterer, helping to clear water of discoloration from driftwood or other impurities, and contains nutrient weeds.Ideal for breeding and rearing of shrimp (for the size of granule as well as the ability of small shrimps to clean the surface of the substrate), and promotes development of aquatic plants. components are 48.2 silica, 23.9 aluminium oxide, 11.3 ferric oxide. Pre wash. Ready for use instantly,Do not mix with other gravels.Change Water properly, otherwise - collapsing in shape during water changes, so be careful.when the tank is first set up will get unstable nitrite levels. there's also other things like be careful with filter flow not to disturb the substrate, not to use under gravel filters.