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).
The way to avoid this becoming a problem with your shed is to make sure that the concrete base does not protrude too far beyond the wall of the shed. The typical advice here I think is that the size of the base should go an inch or two beyond the wall on each side. This gives a very small area for any water to collect.