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).
For construction of a lean-to shed, you need to consider the type of weather in your region. A roof pitch of less than 3/12 -- that is, 3 inches of rise for every foot of horizontal run -- cannot shed rainfall and snow effectively, according to the Minnsnowta Roof Razor, a company that sells roof snow-removal equipment.