This is part of the water management system design.
To prolong the life of your evaporative air conditioner the water is flushed periodically from your evaporative cooler.
The frequency and amount of water dropped depends upon the brand and settings chosen.
You can tell an evaporative air conditioner where the water management system is inadequate, or not operated often enough, because there will be a build up of mineral salts on the evaporative air condiotner.
