Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Make sure you have a refill tube

I bought three of these, but it turns out that some newer low-flow toilets don't have refill tubes. Before you make my mistake, check to see that you do indeed have a tube running into the overflow tube on your toilet. As it is, I can't return these, so now I have three Flush 'N' Sparkles that I need to figure out how to dispose of. Bummer...