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).
1 Then thoroughly spray the shed and run with a 3 per cent solution of maldison. Apply the spray in all cracks, crevices and corners of the shed and thoroughly spray all equipment as well. Also spray the run, especially around trees and posts.  Spray again after 12 days as above, to kill freshly emerging adults.