The discussion centers around the calcium content percentage in anhydrous calcium chloride, with participants noting the difficulty in finding this information online. One contributor mentions that calculating the percentage from molar masses is straightforward, implying that the lack of readily available data is not surprising. The conversation then shifts to the compatibility of calcium chloride with non-polar solvents, particularly vegetable oil, for use in a solar boiler. It is highlighted that ionic compounds like calcium chloride dissolve well in polar solvents, such as water, while non-polar solvents do not mix effectively with ionic compounds. The rationale behind using a non-polar solvent for vaporization in a solar boiler is questioned, emphasizing the challenges of mixing polar and non-polar substances.