One caution: usually people overestimate their pool's volume, but if your dimensions are correct (25 x 50 x 4 + 12' deep end) your volume is closer to 42,000 gallons, with a PF:3

That means one gallon of plain 6% household bleach only adds 1.5 ppm of chlorine to your pool, and that one pound of stabilizer only increases your CYA level by 3 ppm.