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).
How to build a lean-to shed. The first step of the project is to build the base of the shed. As you can see in the image, the shed will be supported by several 4Ã4 skid, placed at about 5-10â from the edges. Build the joists from 2Ã4 lumber and join them together with 3â wood screws.