It is *NEVER* necessary to test CYA 3x per week, much less daily.

Under normal operations, your CYA level is a direct result of CYA added (either as CYA or as stabilized chlorine) MINUS any leakage or splash out. Neither sunlight nor evaporation removes CYA. If your pool gets really slimey, you can lose your CYA over a week or so, but that ONLY happens when there's substantial bacterial growth in the pool.

Regarding 55 gallons of bleach for home pools -- NEVER get it in that volume, unless you can keep it cool -- under 75 degrees. Industrial bleach degrades as a function of temperature and purity. Normal purity industrial bleach can go from 10% to 5% in 2 weeks of high temperature storage (> 90 deg F.)