A .Objective, to dam water back or to slow the flow while filtering out all contaminant filled sediment run off . B. Does the product fiber type really matter? Oil(oil well transport sites) metals ,(metal recycling yards) alkolines (Recycled Concrete) unwanted soil (Brick and Block Plants) C. Size and spacing of devise does matter for a successful application D. Does the ease of removal and replacement access matter to other work on site. E. Site esthetics, wind blown torn products or low profile more natural to nature products.