|  | 
| 
			 
			#3  
			
			
			
			
			
		 | ||||
| 
 | ||||
|   I agree, the filters before the RO membrane, change them all at the same time. If you have the DI as colour changing, then that is not a problem. A TDS meter would be helpful to ascertain when to change the RO and or DI |