they do have different types 
the type I use is the light beige colour and is a more coarse grade of sand. 
I can understand why if it was really fine that it would cause problems. 
was it the white sand? cuz I remember them having some that was white which was much more finer than what I bought. 
		
	
		
		
		
		
			
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				Way too much time and money has gone into this hobby....and yet, I CAN'T STOP
			 
		
		
		
		
	
		
		
	
	
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