Do not use "outdoor" or "splashless" bleach since it contains additives (thickeners) that will cause problems in the pool such as foaming. The germicidal bleach is probably OK if it contains only sodium hypochlorite, water, salt, and a small amount of sodium hydroxide. The best is Clorox Regular bleach that is 6% sodium hypochlorite and also says "5.7% Available Chlorine" on the bottle since this bleach has the lowest amount of "excess lye" with a pH of around 11.9.