danger if used on edible plants, as they can bioaccumulate. However, the water is considered usable for irrigation of ornamental plants and lawns. Various pathogens, including fungal spores, may accumulate in the water, particularly due to its stagnancy. Unlike in distilled water production, the water is not boiled, which would kill pathogens (including bacteria). As with distilled water, beneficial minerals are largely absent. Food-grade dehumidifiers, also called atmospheric water generators, are specifically designed to avoid toxic metal contamination and to keep all water contact surfaces clean. The devices are primarily intended to produce pure water, and the dehumidifying effect is viewed as secondary to their operation. Maintenance If condensate water is handled automatically, most dehumidifiers require very little maintenance. Because of the volume of airflow through the appliance, dust buildup needs to be removed so it does not impede airflow; many designs feature removable and washable air filters. Condensate collection trays and containers may need occasional cleaning to remove debris buildup and prevent clogging of drainage passages, which can cause water leakage and overflow; if large amounts of certain particulates or dust are collected, then this may need to be performed frequently to avoid microbial growth. Applications Relative humidity in dwellings should preferably range from 30% to 50%. Homes and offices Dehumidification within buildings can control: excessive body perspiration buildup that cannot evaporate in moisture-saturated air condensation dripping from cold-water pipes warping and sticking of furniture and doors mold and mildew, which can cause fabrics, books, and furnishings to develop mustiness clothes moths, fleas, cockroaches, woodlice, millipedes, and dust mites, which thrive in damp conditions (basements, crawl spaces, kitchens, bedrooms, bathrooms, spas or indoor pool areas, warehouses, workshops) Construction Dehumidifiers are also used in construction areas and renovations of indoor space to remove excess humidity or mildew. Industrial processes Dehumidifiers are used in industrial climatic chambers, to reduce relative humidity and the dew point in many industrial applications from waste and fresh water treatment plants to indoor grow rooms where the control of moisture is essential. Some industries include: Printing Grinding and machining Food packaging and processing Lithium-ion battery production Equipment room Cold storage room Museum and Archive room Market size According to a 2015 estimate, the projected annual global total addressable market of dehumidifiers was about $3.5 billion by 2022. This includes various types and applications, encompassing different applications such as household and industrial and different technologies such as