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			 Kalk paste might work, (google techniques, dangers, etc). Or else you may just have to grind at it a little every day until it finally gives up. Mucking gloves from Lee Valley will make it a little less tiresome reaching into the tank. 
		
	
		
		
		
		
		
		
			Last edited by soapy; 01-26-2016 at 01:07 AM.  |