1 We can add calcium deposits agent or antiscale agent in order to solve the problem.

2 This paper introduces the principle of ultrasonic antiscale devices, and makes an experiment on ultrasonic antiscale devices at cooling circulatory of turbid water.

3 The result showed that it is a new type effective antiscale for industrial boiler.

4 Seeing that ion exchange process for treatment of boiler feed-water is of high cost and difficult to master, composite antiscale KH- 209 is developed and prepared.

5 The method is used for the efficiency determination of various antiscale processes founded on chemical or physical principles.