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).
You could put down either a concrete or gravel pad. We need a solid base of either gravel or concrete and can not put the sheds on a concrete block because the shed is backed in with a trailer so we would not be able to get it onto the concrete pad if it was not for that than a concrete block would be great.e recommend making the gravel base 2' wider and 2' longer than the size of the shed you get giving you 1' on both sides and ends to help prevent dirt from splashing up on the sidewalls of the building. We recommend a 4 to 6 gravel base of either 3/4 stone also called 57's by some or crusher run.