Let's get to know and understand about ALPS treated water.

ALPS treated water is water which has been purified until it satisfies safety standards for all radioactive materials other than tritium.
For tritium, the water is significantly diluted with seawater before discharge so that it fully satisfies safety standards.

The International Atomic Energy Agency (IAEA), which has extensive expertise related to nuclear power, has also confirmed that discharge into the sea is based on scientific evidence and consistent with international practices.
In addition, regarding discharging into the sea, rigorous reviews are carried out to ensure that IAEA safety standards are being complied with.