Abstract: A device for connecting modular metal shelving units, comprising at least two props (1) and at least one connecting element (2), for mutual coupling of the two props (1). Each prop (1) comprises central couplings (14), first distal couplings (16) and second distal couplings (17), and each of the couplings (14,16,17) comprises a central coupling (11) and a first adjustment slot (12). The connecting element (2) comprises a first grouping (21) of pins (20), which can be inserted into the first distal couplings (16) of a prop (1), and a second grouping (22) of pins (20), which can be inserted into the second distal couplings (17) of another prop (1). The first adjustment slot (12) of the first distal couplings (16) is diametrically opposed to the first adjustment slots (12) of the central couplings (14) and the second distal couplings (17).

Abstract: A device for connecting modular metal shelving units, comprising at least two props (1) and at least one connecting element (2), for mutual coupling of the two props (1). Each prop (1) comprises central couplings (14), first distal couplings (16) and second distal couplings (17), and each of the couplings (14,16,17) comprises a central coupling (11) and a first adjustment slot (12). The connecting element (2) comprises a first grouping (21) of pins (20), which can be inserted into the first distal couplings (16) of a prop (1), and a second grouping (22) of pins (20), which can be inserted into the second distal couplings (17) of another prop (1). The first adjustment slot (12) of the first distal couplings (16) is diametrically opposed to the first adjustment slots (12) of the central couplings (14) and the second distal couplings (17).

Abstract: A water purification system and method based on reverse osmosis is provided. An inlet of supplied water to be purified is driven by a first flow propelling device which drives inlet supplied water flow to an upstream side of a membrane. An outlet of reject water from the upstream side of the membrane is driven by a second flow propelling device. The first and second flow propelling devices are powered by a common driving shaft or otherwise linked or controlled so that a ratio of inlet flow to outlet flow is maintained constant and a rate of permeate flow from a downstream side of the membrane is also kept constant.

Abstract: The present invention is for method and means for purification of water using reversed osmosis. Water is forced through a membrane element (10) under pressure, which is obtained by a high pressure pump (2), where the water which is supplied to the element (10) is both from the outside supplied, unpurified water and internally circulated water that has passed by the element at its inlet side. The high pressure pump operates intermittently and the quantity of water that is circulated internally is at least as large as the quantity of water that is supplied from the outside. After that the pressure has been reduced there is a time delayed flush cleaning of the element (10) by flushing with water that is supplied from outside.