Reg. water validation

Dear All,

Reg. water validation,
we extended a new distribution system from the validated water system to a new facility.
I have a plan to validate distributin lines only covering all user points fell under this distribution systen, Is it sufficient. If it is sufficient how long i have to carry whether it is also as same as regular water system validation? or Is it necessary to validate the entire water system again.

This coming water is the feed water for PSG (pure steam generator), whether i have to wait up to the completion of 2 phases to go for PSG qualification.

Pl comment on this

No need to validate entire water system. Collect the water sample before the new Distribution system & from the water tank and all user points of the new distribution system. This should be carry out for all 3 phases.

u did not answered my second question