Comments about Raritan Raritan K.O. Kills Odors, Gallon:
Rinse out holding tank before first use. Add K.O., use tank, then add K.O. again when pump out is done. Really does kill odors and keep holding tank working as it should. We have used this product for about 10 years of (almost) full time live aboard. According to directions the product is very sensitive to the kind of cleaning products used, so we have followed their directions about that.