My bad: http://pool9.net/pf-hist-form/ . I need to come up with better links, because those confuse me!

I recalc-ed your pool volume, after looking at your submitted dimensions, and Google maps (since you submitted your address -- which only I can see). I posted 15K gallons, but because of the free form indents, it's actually probably less. That puts you in the norm: way more than 50% of pool owners have significantly incorrect figures for their volumes, and more than 3/4 of the errors or on the high side. Since such errors sell more chems, pools stores have NO incentive to correct them.

Anyhow, on your pool, with a PF of 8, a pound of trichlor (90% avail. cl.) will add ~ 7 ppm (8 x 0.9). A gallon of PLAIN 8% househould bleach (~0.7 lbs Cl2 equiv) will add about 6 ppm (8 x 0.7).

Did you retest your CYA?