An apparatus and method for controlling and/or minimizing the formation or accumulation of unwanted deposits on the inside of fluid flow paths by employing at various locations along the path an assembly of permanent magnets oriented such that the fluid flow is preferably from the North magnetic pole to the South magnetic pole. The apparatus including an upper portion and a lower portion with a cylindrical magnet disposed on the surface of the upper portion. The lower portion includes a safety shelf to prevent compression of the magnet by the upper portion and the lower portion.