SaveH2O
A single DN 100 mm pipe draining to the LPOD would also easily exceed its maximum flow capacity of 450 lpm as per AS2200 during a 1:20 ARI. Just check this pipe's size for peace of mind.
I have confirmation this single pipe connnected LPOD is 100mm, I would surprise big builder would not meet AS when they designed this?
I will ask Henley about this.
I am more concern about plumber use 90 mm, I just can't trust them