Membrane filters can be used for final filtration or prefiltration, whereas a depth filter is generally used in clarifying applications where quantitative retention is not required or as a prefilter to prolong the life of a downstream membrane. Membrane and depth filters offer certain advantages and limitations.
Concrete Hard-standing-When using concrete as a surface to support your new shed, you must ensure that it is level, flat and that it is dry in time for your shed delivery and installation. Here are the basic steps: 1  Using pegs and string, mark out the base area (allow 5 cm extra).
1 A bed of 4 or more 3/4 crushed stone, or other porous gravel is required for all sheds over 8' wide. 2  Gravel base is to be 2 feet larger than the shed size. 3  Example: 10x12 shed requires 12x14 base. (see diagram below). 2  Although a level gravel base is best for your shed, buildings 8' wide or less can be set on additional skids running the width of the building. 3  Hill View Mini Barns can provide those for a low additional fee.