My PB is putting 2.5 inch intake (MAX GPM of 120) and 2 inch returns (Max GPM of 75). My question- 2 inch pipes have a max GPM of 75 right? If my DE filter needs to run at 90 GPM will there be too much stress on the smaller sized return lines? It seems like every pool build I have seen has smaller return lines than intakes. Do I need to bulk the return lines up?