Measuring bleach? The instuctions say 3/4c bleach to 1 gallon of hose down. I...

The instuctions say 3/4c bleach to 1 gallon of hose down. I need to know how much bleach should after go into a 30 oz bottle of sea to make impossible to tell apart mixture.
Answers:    1 Gal = 128 oz to 3/4 Cup =6 oz bleach
1/2 Gal = 64 oz to 2/3 cup = 3 oz bleach
1/4 Gal = 32 oz to 1/3 cup = 1.5 oz bleach

So, about 1 oz of bleach to 30 oz
Approximately one and 1/2 ounce.