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).
Preparation. 1  1. Clear the area of any objects or material that would interfere in the pouring process. This includes grass, rocks, trees, shrubs, and even old concrete. 2  2. Prepare your subbase. Your subbase is another word for any material on which the concrete rests. 3  3. Prepare a form.