Just be sure to periodically check the float switch (assuming that's what you're using). If a snail or gunk gets in there the switch can fail and you will fill your sump (and the floor) with top off water :-) Hasn't happened to me yet, but I fear the day might come.. hehe. My top off switch has a safety switch too though so if it gets too high the second switch activates and turns off the pump.
The other setup hurdle that I ran into with the top off system was how to avoid a siphon. when I first set it up and tested it I accidentally create a siphon between the top off water and the sump. Because of this the sump would continue to fill with top off water even after the pump turned off. Yikes! To avoid the siphon what I did was make sure the outlet of the top off water was well above any water line. My top off line is 1/2 an inch (diameter) and I just inserted that into a larger 1.5 inch tube and inserted that into the sump. 1/2 inch outlet sits above the sump and shoots water into the 1.5 inch tube which directs the water down into the sump. I'm sure there are more glamorous ways to do this but it works.
You can get food safe garbage bins that are really narrow that will hold a lot of water. I got one from the superstore. it is only 8 inches wide by 12 inches long by 18 inches tall ( roughly).
K.
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