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).
Cover the roof of the shed with roofing felt, making sure the strips overlap at least 2â³. Secure the tar paper to the plywood sheets with roofing staples. In addition, cut a 12â³ piece for the top ridge. Fit the side drip edges over the roofing felt, while the bottom drip edges should be fit under.