Well they have 3 different chlorhexidine's and the one I have is different. I'm sure it's okay but you want to check your dilution.

The one I have recommends 1 oz per gallon of water, so I put 2 oz in a gallon of water per a friend who recommended doubling the dosage. I'm not sure about 4% and the 50/50 one either. Try to message The Serpent Merchant as he knows more about that stuff then me.