water calculation

The pool I operate has really bad water circulation because we don't have any return eyeballs. The return pipe measures 1.5 inches. I bought a bunch of return eyeballs that fit the pipe, but they pop out as soon as I turn on the pump. So, I tried another set with a slightly thicker middle...

Hi Everyone, Hope youre doing great today Wanted to make sure I understand the calculation for how much water the spa holds. It is 81 (L) x 63 (w) x 33 (D) / 231? Not sure where or why it is divided by 231. Is it always divided by 231 and where does that number come from? If true, is the...