Here are two "homebrew" holding tank solutions to reduce or eliminate holding tank odors.
1 c ammonia, 1 c PineSol, 1c fabric softener, ½ box baking soda (8 oz).
Put in gallon jug, fill with water. Use two cups for 50 gal holding tank.
Equal amounts Arm & Hammer soda and Borax. Do not use baking soda or soda with detergent in it. Use only pure soda, usually on the bottom shelf.
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