From phyto- + plankton. From Ancient Greek φυτόν (phuton, “plant”) + πλαγκτόν (plankton), neuter of πλαγκτός (planktos, “wandering”). However, they are no longer classified as plants, so the terminology is showing a historical meaning.
English Wiktionary. Available under CC-BY-SA license.
Marine phytoplankton - Rich in natural minerals and vitamins, it supports a healthy heart.
That is, the concentration of H-ions decreases and that of the HO-ions increases; the water becomes more alkaline because the carbonic acid of the bicarbonate has been abstracted by the phytoplankton to the extent that normal carbonate is left.