We also use the Aqua-Kem liquid, and are pleased with it. We buy the big bottles (gallon), and refill the small bottles (8 oz), which are quite handy to store and use. If we are stopping somewhere just overnight, we use half of an 8 oz bottle. If our stop will be any longer, we use a full 8 oz bottle, which works nicely right up to a full toilet. When we are leaving a campground, we empty the toilet, then add a couple tablespoons of Aqua-Kem and a pint or so of water to the toilet, and let it slosh around while we drive. Seems to work well for us.
Bill
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