hi
i have a 200 gpd unit with di unit running into a 1000 ltr ibc, when tank is full it switches of , i only use about 300 ltrs per day, so i turn of ro for a few days when tank is full. when i restart ro , i run to drain for about 15 mins before i reconnect to di, heres the problem, when tds reads 006 or under i reconnect di , then take another reading after di , it is way higher

, it comes down to 000 after a while , but is using resin quicker , any ideas .
daz