Abstract: A composition of alkali carbonate peroxyhydrate in a quantity of 45 to 85% by weight relative to a total amount of the composition and an alkali hydrogen carbonate is provided for combating pathogenic germs and parasites in water of aquaculture, ponds, and aquariums; for destroying thread algae in water; for processing water. The addition of alkali hydrogen carbonate to alkali percarbonate peroxyhydrate stabilizes the alkali percarbonate peroxyhydrates relative to combustible materials. The alkali carbonate peroxyhydrate is preferably Na2CO3 and xH2O2.

Abstract: A composition of alkali carbonate peroxyhydrate in a quantity of 45 to 85% by weight relative to a total amount of the composition and an alkali hydrogen carbonate is provided for combating pathogenic germs and parasites in water of aquaculture, ponds, and aquariums; for destroying thread algae in water; for processing water. The addition of alkali hydrogen carbonate to alkali percarbonate peroxyhydrate stabilizes the alkali percarbonate peroxyhydrates relative to combustible materials. The alkali carbonate peroxyhydrate is preferably Na2CO3 and xH2O2.

Abstract: In a method for initiating microbiological processes in stagnant and flowing bodies of water heterotrophic microorganisms in immobilized form are added to the water. The heterotrophic microorganisms are selected from heterotrophic nitrifying microorganisms. The heterotrophic microorganisms are present in dried form and are immobilized on a material that is suitable as a water filter or can be pressed into a tablet.

Abstract: A composition of alkali carbonate peroxyhydrate in a quantity of 45 to 85% by weight relative to a total amount of the composition and an alkali hydrogen carbonate is provided for combating pathogenic germs and parasites in water of aquaculture, ponds, and aquariums; for destroying thread algae in water; for processing water. The addition of alkali hydrogen carbonate to alkali percarbonate peroxyhydrate stabilizes the alkali percarbonate peroxyhydrates relative to combustible materials. The alkali carbonate peroxyhydrate is preferably Na2CO3 and xH2O2.

Abstract: A damping element for a catching carriage for damping the catching impact in the event of a fall of a user from a height includes a first end adapted to be connected to the carriage and a lug disposed at a second end adapted to be connected to a catching belt secured to the user. The damping element is releasably fixed in a non-rectilinear shape by at least one frangible link dimensioned for releasing the damping element from its non-rectilinear shape when a certain load is applied, so that it can damp the catching impact.

Abstract: The device for allowing a person to safely step off from and onto a climbing track on a roof edge, a roof slope, a shaft opening or similar, includes a guide rail (10) for guiding a catching device to which a person using the climbing path can be secured, and an extension piece (24) of the guide rail (10). The extension piece (24) of the guide rail (10) can be moved between a first and a second position, the extension piece (24) being so arranged in the first position that it does not project above the guide rail (10), and being aligned in longitudinal direction with the guide rail in the second position. The extension piece (24) can be guided displaceable along the guide rail (10) and at a distance from the latter and can be swivelled by 180° in the final position, which corresponds to the second position, so that it is in alignment with the extension (10).