Heavy-duty, electronic ScaleBlaster offers environmentally friendly alternative to chemical descaling of pipes, boilers, chillers, cooling towers, heat exchangers, and evaporators. Handles non-steel pipes from 12 to 40 ins. in dia. and steel pipes from 4 to 26 ins. in dia. Signal coils continuously transmit fluctuating square wave frequencies through pipe wall to movingstream inside. Microprocessor-controlled frequencies cause calcium carbonates to lose their adhesive, scale-forming properties. Prevents new scales from forming.