Chemical free cooling tower treatment system controls scale, corrosion, and bio-growth without any kind of chemicals. It produces a pulsed, time-varying, induced field inside a PVC pipe that is fit conveniently into the cooling tower's recirculating water system. The electric signal changes the way minerals in the water precipitate, totally avoiding hard-lime scale by instead producing a non-sticking mineral powder in the bulk water. This powder is readily filterable and mostly removed during normal blowdown, or it settles loosely in the cooling tower basin for easy annual removal. Bacteria are incorporated into this mineral powder and therefore leave the system by blowdown, filtration, or settling. The encapsulated bacteria cannot reproduce, thus resulting in an exceedingly low bacteria population. Elimination of scale and biofilm throughout the system results in greater heat transfer and lower energy costs.