Why does the revitaliser not create the water spray when switched on?

During the air cleaning process, dirt is trapped in the purifying solution and accumulates on the inside of the funnel. This could cause a blockage in the funnel and prevent the water flow through the funnel. The machine must therefore be cleaned on a regular basis (once a month), especially the funnel (fortnightly). The cleaning cycle can vary depending on the cleanliness of the air in your area.