Particularly popular are the dosing pumps to constantly balance the consumption by corals on calcium, carbonate hardness and magnesium. So the consumption is calculated over a couple of days and the dosing pump is set to this quantity.
Regarding stock solutions, the salts are finally added to the aquarium with the help of dosing pumps. Dosing pumps can fulfill very different requirements: So e.g. even liquid plankton-solutions, fertilizer, lime water and lots more can be dosed regularly.