Patent ID: 7462279

Claim:
An apparatus for treating a body of water with particles of calcium carbonate, said apparatus comprising: a drum having a first end wall and a second end wall, said first end wall having an opening into the interior of said drum, a drive motor adapted to rotate said drum about an axis, a conveyor for supplying said drum with limestone rock pieces, whereby the rotation of said drum by said drive motor causes said limestone rock pieces to be crushed, abraded or ground to produce calcium carbonate particles, a pump for supplying water to the interior of said drum, apertures in one or both of said first end wall and said second end wall, said apertures being dimensioned to permit the passage therethrough of particles that are only below a predetermined size, a sump located around a lower portion of the outside of said drum for receiving a mixture of water and said particles, that has passed through said apertures, and a venturi for sucking said mixture of water and said particles from said sump and discharging said mixture into said body of water.