Cyanuric acid missing

[PoolDoc]

Wow.

36K gallon pool (3.34 pool factor)

Initial:
pH = 7.8
TA = 100
CYA = 50

Startup:
pH = 8.0+
TA = ?
CYA = 0

Cleanup:
+ 72.5 gallons of bleach (3.34 * 72.5 * 0.51 =) 123 ppm chlorine (72.5 x $2.50? = ~$180?)
[ very close to Chem_Geek's estimate of 2.5+ ppm of chlorine per ppm of CYA degraded ]
+ 9 lb CYA ( 9 * 3.34 = ) 30 ppm
+ 12 lbs soda

Operations:
40 gal bleach / month => 0.51*40*3.34 = 68 ppm/month or about 2 ppm/day
(a little high, I think)