Kontrol moisture absorbing crystals readily attract excess humidity from the air by a simple chemical process. The crystals will continue to function effectively for up to 2-3 months after exposure to the surrounding air. Used in a moisture trap, the crystals will reduce moisture & create a healthier environment in your boat, motorhome, home, car, or office. Absorbs damp & reduces condensation; reduces musty odours, mould & mildew; protects fabrics & soft furnishings. All contents are 100% non-toxic & poison-free and will not cause harm to the environment, animals, or people. All plastic is recyclable and range includes reusable options. Contents - water & salt (calcium chloride) - can be disposed in sinks, toilet, or outside (including lakes & sea) without causing any harm.