Others have answered the question already, but I want to extent on my comment: Long standing water, same as boiled water loses some CO2. CO2 in water forms carb

Others have answered the question already, but I want to extent on my comment: Long standing water, same as boiled water loses some CO2. CO2 in water forms carbonic acid in part, which dissolves calcium salts. Removing the acid, will make some of the calcium salts insoluble (that’s why you get a buildup in water boilers). Most other salts are unaffected by that. So the disposal of collected water under the pot is without an alternative. Even if you’re using demineralized water, you need to flush the plant’s toilet.