The kew nilfisk alto multi ll 30t has been designed for use indoors or outdoors wet or dry dust or rubble it can even be used to empty blocked sinks clean out gutters and empty rain gullies it has a 30 litre plastic canister which has a dry capacity of 22 litre and a wet capacity of 18 litre and is supplied with a washable cartridge filter and fleece filter dust bag the washable cartridge filter means that you can move from dry to wet use without removing the filter can be used with or without t