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).
Add extra dirt to the spot of your gravel pad to build it up from the main ground. The ground should slope away consistently for about 10 feet. This allows for drainage within the shed. Stake off the mound of dirt.Place stakes at all corners of the mound and then add batter boards. Your gravel will go inside this area.dd extra dirt to the spot of your gravel pad to build it up from the main ground. The ground should slope away consistently for about 10 feet. This allows for drainage within the shed. Stake off the mound of dirt. Place stakes at all corners of the mound and then add batter boards. Your gravel will go inside this area.