Opportunistic feeders, their diet varies from one region to another. In the Antarctic, killer whales eat about 67% fishes, 27% marine mammals, and 6% squids. Killer whales in the Bering Sea (near Alaska) eat about 65% fishes, 20% squids, and 15% marine mammals.
Even though your shower grout looks dry, using it too early or sealing it before it's ready may damage it, leading to premature failure. Most cement-based grouts require a cure time of 48 to 72 hours before applying a penetrating sealer.
Epoxy Grout. Epoxy grout does not require a sealant when used in showers because it is waterproof. Check the manufacturer's directions for curing times for specific brands, but generally expect to leave it drying for seven days. Mild use is OK after about eight hours, but avoid using chemical-based products on it for as much as 14 days.