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).
Steps. 1  1. Level the ground (if necessary) and install deck piers along a grid to support the shed. 2  2. String support beams lengthwise across the deck piers. 3  3. Attach joists to the support beams and separate them with blocking.  4. Nail plywood sheeting to the joists to form the 1  floor. 5. Build the framework for all four walls.