It is good that everyone is aiming for zero phostphates, however some logic you have to laugh at,
Collection saltwater from a polluted beach like takapuna which has high organics, phostphates, bactaria. then using it on a tank thus adding all the rubbish, then using ro for top up so you dont add any phostphates and then removing the waste with zeovit.
Why use RO if you adding pollutants anyway??