IV RECENTLY CHANGED THE RO UNIT ON MY IONIC SYSTEM YET ITS STILL TAKIN SAY 10HOURS TO FILL ANY IDEAS Y THIS IS HAPPENING I DNT PERFORM SALT BACKWASH AS I DNT KNOW HOW COULD THIS BE THE REASON.SHOULD I HAVE THE WASTE WATER OPEN SO THAT ITS RUNNING OUT OR TRICKLING??ANY ADVICE WOULD BE APPRECIATED