These cloth filter bags can be installed for all general vacuuming applications where water is not present. Cloth filter bags can be continuously re-used many times as it can be opened & closed at one end to remove the debris when the bag is full. The cloth filter bag can be cleaned using a piece of timber or such to tap on the outer shell of the bag to dislodge the debris from the bag fibres. Compressed air can also be used to clean the cloth filter bag even further but ensure you use PPE when using compressed air to clean the cloth filter bag. The cloth filter bags are for general purpose applications when vacuuming dry debris such as wood shavings, wood dusts, general dirt & dust etc. Please NOTE: A VACUUM FILTER ONLY WORKS WHEN IT IS CLEAN! IT IS RECOMMENDED THAT THE FILTER BE CLEANED REGULARLY (PRIOR TO EACH USE & PERIODICALLY DURING USE) SO THE FILTER CAN FUNCTION CORRECTLY. CAUTION: DO NOT USE CLOTH FILTER BAG IN WET VACUUMING APPLICATIONS.