I read where it's best to clean new K1 with Potassium Permanganate to help the bacteria to cling to the K1 but I can't find it locally. I did see where someone said bleach does the same thing and leaves the K1 white so you can see it turn brown form the bacteria. Is this true and is there information on how much to add to 100 gallons? Or is there something else that would work that you can find locally?