So I took one of my dogs to the vet the other day to find out he has giardia. Now that he's on anti-biotics I'm told I need to clean my yard. I'm also told that bleach is the best way to do this as it'll kill anything. I need to know how much bleach I need to successfully kill any parasites, but not kill my grass at the same time. I have a one gallon sprayer. Is a cup of bleach per gallon too strong or not strong enough? What's everyone else's experience with this?