not enough air
			 
			 
			
		
		
		
		i suspect you may not have enough air getting into the drain to allow the water to exit smoothly therefore causing a siphon at a certain level when filling up. Also check the air hole for salt creep which in turn decreases the air into the durso. If the hole is unobstructed, drill a hole the next size up on your drill bit set and test it out. 
		
	
		
		
		
		
			
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If people don't die, it wouldn't make living important. 
And why do we fall? So we can learn to pick ourselves up.
			 
		
		
		
		
	
		
		
	
	
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