"Aquarists have used limewater very successfully for a number of years, and it is the system that I use in my aquarium. It is comprised of an aqueous solution of calcium and hydroxide ions that can be made by dissolving either quicklime or lime in fresh water. Note that the water must be freshwater. Combining lime with seawater will result in a mess of precipitated magnesium and calcium carbonates and hydroxides."
? seawater? .... would the same thing happen if the limewater was mixed with seaweed?
And, fluoride binds to calcium. Limewater would be an excellent F delivery system, yes?