This can't be true, water into a T at same volume coming out? My pool builder told me today, that under pressure, the waterflow through a 2" tube into a T connector with 2" tubes out of the T; that the flow will be the same.   60GPM in and 60GPM out of both ends.  Seriously, is that true, not some violation of newton's laws?

I expected 60GPM in and 30GPM out of both ends for total 60GPM out.