Our slate waterfalls are made of hand picked and gathered slate from the Huron mountains in Michigan's Upper Peninsula. Each piece is diamond drilled with a proprietary process that yields extreme accuracy. This means there is no visible plumbing. It also means that there is no glue or sealer used. The pieces can be rearranged however and as often as you wish. Many people further personalise their waterfalls with the addition of small figurines and realistic aquatic plants.
The Slate Products, LLC waterfalls are whisper quiet. Sixteen different pumps were tested during the development of these units. All sixteen were touted by their manufacturers as being quiet. Only two of the pumps met our standards. Of these, we bought the one with the better warranty for use in our products. You will not hear the pump running on our units. Only the quiet and gentle falling of water.
Maintenance on the waterfalls is a lesson in simplicity. Just add water. In dry environs they may require 1 to 2 quarts per week. The waterfalls are designed so that the pumps will not burn out if the water gets low. The water stops coming out the top of the unit and the pump continues to do its merry thing. We have one unit that hasn't been shut off since February of 2004.
The slate waterfalls act as a humidifier inside the house and a birdbath when placed outside.