I have been using Ridex in my motorhome for over 20 years. I used the original Ridex "before" in my storage tanks on my 41ft RV - just a full cap for a 40 gallon tank. It took over 10 days! It eliminated the odor and the bacteria took care of ANY solids. I was pleasantly surprised to see Ridex launching an RV formula and I still use the product (despite some skeptics).
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