>so perhaps the “electrolysis” was less chemical and more biological. According to https://en.wikipedia.org/wiki/Biorock https://en.wikipedia.org/wiki/Biorock

>so perhaps the “electrolysis” was less chemical and more biological. According to https://en.wikipedia.org/wiki/Biorock https://en.wikipedia.org/wiki/Biorock it's chemical: > The chemical process that takes place on the cathode is as follows: Calcium carbonate (aragonite) combines with magnesium, chloride and hydroxyl ions to slowly accrete around the cathode coating it with a thick layer of material similar in composition to magnesium oxychloride cement. Over time cathodic protection replaces the negative chloride ion (Cl-) with dissolved bicarbonate (HCO3-) to harden the coating to a hydromagnesite-aragonite mixture with gaseous oxygen evolving through the porous structure. But it does seem the process creates an environment that's very beneficial for coral growth in general.