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					Originally Posted by  daniella3d
					 
				 
				My worries were more in case the main pipe would get clogged, lets say if a fish manage to get inside.  I guess this is very unlikely anyway.  In that case that the main pipe would be clogged inside, no emergency elbow would help.  This is why the design  with 2 overflow is a bit safer I tought. 
			
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 That's why I went with the slotted pipe. No fish could get through that. And even your emergency opening can be covered with a slotted cap or something so that a fish can't jump in.
But your design there would work, too, with the 2 pipes. I just think it is a little overkill.