HYDRATED Lime (Calcium Hydroxide) is far different and far more caustic than Ag Lime (Calcium Carbonate or Crushed Dolomite Limestone).

Hy Lime runs about $7-$10 per 50 pound bag and needs to be very concentrated to shock and kill the fish in order to safely sterilize a pond. When sterilizing a pond, you realy can't OVER apply hydrated lime, but with a significant water depth, you could easily UNDER apply it and never reach the concentration?high Ph needed to kill all the critters.

Also, a drawdown will allow an easier access to cleaing out all the dead fish before the stench becomes overwhelming. (Put some Vick's Vapo Rub in each nostril if the stench makes you wretch...it kills the odor.