A method, system and device for facilitating the retrieval of a marine anchor from an underwater obstruction, the device being configured to actuate when subjected to a force load of a predetermined peak force threshold to effect a change in the point of retrieval that an anchor rode makes with the anchor. The halogen-free flame-retardant polymer composition includes a base polymer including 60 to 70% by mass of LLDPE, 10% by mass or more of EVA having a melt flow rate of 100 or more, and 10 to 20% by mass of maleic acid-modified polyolefin, a metal hydroxide added at a ratio of 150 to 220 parts by mass relative to 100 parts by mass of the base polymer, and carbon black. 0% by weight, based on the paper weight of the ready-produced filter material, and also processes for producing same.