Abstract: A method for removing contaminants from a fluid-material comprising: providing at least one substrate comprising a three-dimensional knit in an initial configuration made of knitted polymeric fiber which substantially resumes the initial configuration after it is released from stretching or compressing force; and submerging said at least one substrate in a fluidic material for treatment of the fluidic material.

Abstract: A floating water treatment device for biological treatment of water in a body of water, the device comprising: a submerged biomass-carrying system having at least one biomass-carrying element; a water aeration device adapted to aerate the water in the body of water in the vicinity of the biomass-carrying system; and at least one flotation system, having at least one floating element, the at least one flotation system adapted to float on the surface of the body of water and to support the submerged biomass-carrying system and water aeration device from totally submerging into the body of water.

Abstract: A method for removing contaminants from a fluid-material comprising: providing at least one substrate comprising a three-dimensional knit in an initial configuration made of knitted polymeric fiber which substantially resumes the initial configuration after it is released from stretching or compressing force; and submerging said at least one substrate in a fluidic material for treatment of the fluidic material.

Abstract: The embodiments of the present invention aim to integrate two common agricultural-practices, first of hothouses cover application, and second of protective netting. A method for reversibly sealing the pores of netting by applying a sealing agent on a net in a reversible manner, thereby producing an agricultural covering to protect underlying crops, particularly from cold conditions, is disclosed. A method for reversibly opening the pores of a sealed net, by exposing said portion of the net to chemical or physical unsealing agents and thus opening at least a portion of the sealed pores of the net, is conjointly disclosed. Furthermore, a method of including additives to the sealing agent, which enhances the protective properties of the resultant covering such as its ability to repel insects, its ability to block ultraviolet or other radiation, its water proofing qualities, is also disclosed.