Scale removal

Claim 1

THE METHOD OF REMOVING CARBONATE SCALE FROM A BOILER WHEN SAID BOILER IS OPERATING WHICH CONSISTS ESSENTIALLY OF THE STEPS: (A) ADDING TO WATER IN A BOILER FROM 0.05% TI 2.0% BY WEIGHT OF A COMPOSITION COMPRISING AN ALKALI METAL SALT OF A HYDROXY SUBSTITUTED CARBOXYLIC ACID, SELECTED FROM THE GROUP CONSISTING OF MALIC, MALONIC, TARTARIC, CITRIC, GLUCONIC, LACTIC, AND SALICYLIC, THE CALCIUM SALT OF SAID ACID BEING SOLUBLE IN WATER AT 20* C. TO THE EXTENT OF AT LEAST 500 PARTS PE MILLION, AND SAID ACID HAVING A DISSOCIATION CONSTANT OF FROM 2 X10-3, TO 1X10-5, AN ORGANIC SLUDGE CONDITIONING AGENT OF LARGE MOLECULAR DIMENSIONS AND A POLYOXYALKYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 1,000 WITH THE WEIGHT RATIO OF THE SALT TO THE SLUDGE CONDITIONER BEING WITHIN THE RANGE OF 2:1 TO 1:2 AND WITH THE WEIGHT RATIO OF THE SLUDGE CONDITIONER TO SAID GLYCOL COMPOUND BEING WITHIN THE RANGE OF 300:1 TO 2:1; (B) CONTINUING NORMAL OPERATION OF SAID BOILER UNTIL THE CARBONATE SCALE HAS BEEN LOOSENED AND DISPERSED AND ; (C) BLOWING DOEN SAID BOILER.