I have the Sewer Solution and absolutely love it. Have been using it for about 9 years without any issues.
I could be really wrong, but I think the other two are more about cleaning out your tanks. While the Sewer Solution apparently is advertised as a clean-out devise, I use it as a macerator.
I've talked about it a couple of times here. If you search my posts you'll find more info. on it. If you have specific questions feel free to PM me & I'll be happy to answer.
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