The influences of impurity ions (Mg2+, Zn2+ Fe2+, Fe3+, and Al3+) and radiofrequency (44 MHz) electric held (RF) on calcium carbonate deposition in glass capillaries were studied. Calcium carbonate was precipitated from 0.1 M CaCl2 and Na2CO3 solutions (100 + 100 ml) just before the inlet to the capillary. It was found that except for Al3+ ions at 0.001 M concentration, the rest of the ions studied decreased CaCO3 deposition. A minor influence of the RF field on the deposition was found in some of the systems tested, but it was in the range of the standard deviation of the results. An increase in deposition was observed in systems without impurity ions when equimolar volumes (500 + 500 ml) of 0.0025 M solutions of CaCl2 and Na2CO3 were used for the experiment.