Table 1.

Ionic composition and concentrations in the boiling pool shown in Figure 3.

Cations	NH4+	Na+	Ca2+	Fe3+	K+	Mg2+	Al3+	H+
mM	0.9	0.6	0.31	0.11	0.12	0.13	0.11	1.0
Anions	SO42−	Cl−	SiO4
mM	2.2	0.04	3.1