Hi Bro,
Remineralization is needed when you are using it in fresh water application. For marine, we either uses DI for water top up or with salt-mix, Salt-mix contains the necessary trace and minerals need by the tank thus there is no need to remineralize your DI water. As for water top up, it replaces evaporated water without the minerals thus it is also not necessary to remineralize.
If your TDS is measuring 0, I think it should be safe to use without needing to add anti-chlorine.
HTH