sizing

My old single-speed pump and 36 Sq Ft Nautilus NS DE Filter finally died last season. It is time to get new stuff starting this season. My pool specs are close to the ones from this thread: https://www.troublefreepool.com/threads/new-filter-pump-20x40-in-ground-37-000-gallons.179050/ But that...

Hello all! Is there a way to determine pool volume by some kind of chemical addition at a known value and gauging the reaction in the pool itself? I should be somewhere between 13.5 and 15k I think, but I would really like to know for sure. Anyone have a proven method they could share?