laterite

[Linkindoc at aol_com]

To make a long boring story very short, is it possible for laterite to absorb 
"toxic chemicals" and continue to leach them back into the water over a 
period of time? If this is highly likely or even possible, should the entire 
gravel/laterite substrate be then discarded? I hope one of you can answer 
this vague question since the "chemical" in question remains unknown. Thank 
you.


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