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Thanks! I think Ive pretty much got everything.

I understand that, but what happens if the overflow gets clogged or loses its syphon? Wont that burn up the pump once its pumped everthing back to the tank and the overflow isnt returning any to the sump? Also, wont that cause a little bit to flood over the tank??

Why do you think it might fail? Its essentially the same thing as a HOB box. The hab box with the overflow in the tank have a syphon, as does the one I linked. Im not questioning ya, just trying to learn all I can before I build one. I was under the impression that the whole point of a sump is...

I do get it now, but you mentioned burning up the pump. Say youre using a powerhead that moves 100gph. I would think that an overflow box trickling would only dump 20-30gph into the sump. So wouldnt the powerhead eventually suck all of the water in the sump out? Granted, the overflow box would...

OK, I'll preface this thread with, yes, Im an idiot. For some reason I cant quite grasp the sump idea. Ive read a 100 threads and watched just as many videos on DIY sumps. Pretty **** simple and straight forward. Here's my delimma. Why do you need an overflow box?? Cant you just run one hose...