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A hand-shaped planter made of hypertufa. Aggregates are generally Sphagnum (peat moss), sand, and perlite or vermiculite. [1] Coconut coir is coming to take the place of sphagnum moss, as the latter is a very slowly renewing natural resource and the former is a ready byproduct of the coconut industry— it has all the advantages of the moss but without the environmental costs.
The replaceable plastic bags with a typical volume of 500 or 1000 liters make the container easy to clean and reuse, which is needed for use with food, as strict hygiene regulations must be observed. The space-saving intermediate bulk containers are used in the pharmaceutical, cosmetics and food industries.
The most common materials used in modern greenhouses for walls and roofs are rigid plastic made of polycarbonate, plastic film made of polyethylene, or glass panes. [1] When the inside of a greenhouse is exposed to sunlight, the temperature increases, providing a sheltered environment for plants to grow even in cold weather.
Guttering in its earliest form consisted of lined wooden or stone troughs. Lead was a popular liner and is still used in pitched valley gutters. Many materials have been used to make guttering: cast iron , asbestos cement , UPVC (PVCu), cast and extruded aluminium , galvanized steel , wood , copper , zinc , and bamboo .
Parabolic troughs, dishes and towers described in this section are used almost exclusively in solar power generating stations or for research purposes. Parabolic troughs have been used for some commercial solar air conditioning systems. Although simple, these solar concentrators are quite far from the theoretical maximum concentration.
Pipe wrenches are classified by the length of the handle. They are generally available in sizes from 6 inches (150 mm) to 48 inches (1,200 mm) or larger. They are usually made of forged steel. Today, aluminium might be substituted to reduce the weight of the body of the wrench, although the teeth and jaw remain steel.