Note volume revision -- formula for oval pools is r1 x r2 x π x water depth x 7.46 gal/cft . On your pool that is 8 x 12 x 3.14 x 3.5 x 7.46 = 7,870 or ~8,000 gallons.

If your ACTUAL water depth is 4', then it would be 9,000 gallons.

Is this Waterway package what you have? http://www.waterwayplastics.com/wp-c...-0094.0212.pdf