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A few years ago, I conducted a similar experiment (and posted it on the forum), comparing black and gray water tank treatments using dog poop. In that experiment, TankTechsRx came out the winner over the other product (I’m sorry, I no longer remember that other product’s name), as it did a much better job of reducing the odor. I recently encountered another treatment with very good reviews, so I bought a bottle of it—Unique RV Digest-It—to compare with my TankTechsRx. The experiment was this: I mixed a capful of each product with water to nearly fill a small glass, and then I placed five pieces of small dog food kibble in each glass and let them sit. The photo showing the glass with the brown colored liquid is the one with TankTechsRx product, which is naturally brown. Result: Within 12 hours or so, the Unique RV Digest-It had reduced the kibble to a sludge at the bottom of the glass, whereas the glass with the TankTechsRx still held solid chunks of kibble. The odor was also different, with the TankTechsRx glass smelling a bit funky, while the Unique RV Digest-It glass had a faint, but rather pleasant, almost floral, smell to it. I will be using Unique RV Digest-It from now on in my gray water tank. We have a composting toilet, so we don’t use a black water tank. However, we have been spraying a mixture of water and TankTechsRx in our composting toilet, which has seemed to help with the composting process and odor control. I will now be trying the Unique RV Digest-It in the same way, expecting good results. I would surmise from my experiment that Unique RV Digest-It would work well in a black water tank and accomplishing what it advertises: 1. BREAKS DOWN SOLID WASTE INSIDE TANKS. Liquifies human waste and all brands of toilet paper. Digests residual sludge from years of build-up. Works in black and gray tanks. 2. ELIMINATES TOILET & TANK ODORS without masking. Extra strength activated cleaners eliminate odors at their source without covering them with overpowering perfumes. 3. HELPS PREVENT SENSOR MALFUNCTION. Cleans and removes solid waste and paper before it can cling to sensor probes, preventing misreads. No, I have no association with either company. Yes, I suggest others give Digest-It a try.