Jason - I have thought about useing a large drum like that, but I think I would like something that I could fit into the stand, beside and above the sump.  I  
 
Jason / Snappy - I have had this sump running for awhile and havent had a problem with the float (even if I did with the current set up it would likely only result in 4 g being added to a total volume of about 90g so it wouldnt do too much damage).   
 
How would the float valve fail?  It looks like a pretty simple set up with not much that could go wrong.  That being said I should look into it before I change something so that I could end up with a 'fresh tank and salt floor'. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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