The pool is 3.7 long x 2.0 wide and

The pool is 3.7 long x 2.0 wide and 1.35 deep. = 9.99 cubic metres

But has 3.2 metre long seat built in at .40 wide and .80 high = 1.02 cubic metres
Plus 3 steps = approx. .90 cubic metres

Water volume 9.99 less 1.02 + .90 = total 8.07 cubic metres water volume or 8.000 litres

Hope that explains it.

Hasil (Bahasa Indonesia) 2:

Kolam renang 3,7 panjang x 2,0 lebar dan 1,35 mendalam. = 9,99 meter kubik Tapi memiliki 3,2 meter yang duduk lama dibangun di di 0,40 lebar dan 0,80 tinggi = 1,02 meter kubik Ditambah 3 langkah = approx. .90 Meter kubik volume yang air 9,99 kurang 1,02 + 0,90 = Total 8.07 meter kubik volume airnya atau 8.000 liter Harapan yang menjelaskan itu.