(Quote)
In reef aquariums Kalkwasser can just about eliminate phosphate. At a pH above 8.9 phosphate precipitates in the water as insoluble phosphate and flocks out. Marine aquariums kept above a pH of 8.4 allow some phosphate to be bound to rocks and substrate in an insoluble form. Nevertheless it will become soluble if the pH drops below 8.
http://www.algone.com/phosphates.phphtt ... phates.php
Is this true, thanks?