Specially designed for narrow surfaces like windowsills, this discreet, slimline moisture absorber fits perfectly behind curtains or blinds to help reduce condensation—one of the main culprits behind mould, mildew, and musty odours. In these enclosed spots where airflow is restricted, warm indoor air can condense on cold window surfaces, creating a damp environment that damages sills, stains curtains, and encourages mould to grow. This Slimline Unit quietly draws in and traps this excess moisture before it causes problems.

Unlike bulkier tubs or hanging bags, the Slimline’s compact, horizontal design makes it ideal for other tight spaces too—think wardrobes, cupboards, caravans, and under sinks. Using powerful calcium chloride crystals, it absorbs moisture from the air and collects it safely in the base of the unit—no power, no noise, and no mess. It’s also refillable, so you can keep moisture at bay for the long haul by topping it up with DampFree Slimline Refill Pouches (sold separately).