Originally Posted by STL Ponds and Waterfalls
I havent any test but that is what I was told when we did a permeable parking lot that was connected to a stream. Problem is without independant testing how can you really determine the filtering realities.
This is absolutely true of ANY manufacturer's claim of product performance. Common sense will tell you that if a product 'filters' it removes and holds whatever substance(s) may have been in solution. Over time these removed substances build up and the said product will clog. In this case, the permeable paving would become impermeable and no different than any other paving material.