1. Don't adjust to the max amount of water through the tap,keep it in a medium level,so it won't cause so many bubbles.
2.The lid is make from plexigrass,it should not get damage under the ordinary area,it may got cracked during the delivery.
3.The exhaust fan can't purify the the room's dust.The new walnut shell could cause the dust while we use it,after put the polishing paste it will become better.
4.We are sure the water pump is well work because we had did some test bafore delivery.Any signs were showing?