John has researched many ways to use small volumes of Geothermal water most effectively. This system has been operating for over three years in the basement. During that period we have helped John develop several simple new ways to mass culture corals. The round tank in the floor is four foot wide and two feet deep. It has over one hundred feet of one inch black pipe around the outside of it that is heated with Geothermal water.
Plastic sheeting is wrapped around the pipe and a layer of sand is between the tank and the ground.
A round plenum two feet wide and seven inches deep is in the center of this tank. The tank has a layer of Carib Sea Sea Flor aragonite gravel five inches deep. John has plumbed the tank with high quality hot tub fixtures and magnetic drive pumps. These fixtures allow the water to enter and exit the tank without slowing the circular movement of the water. The brick floor of the greenhouse and the outer walls of the tank have over two hundred feet of pipe buried in several tons of fine grained builders sand.