u need 2 di resin bottles side by side 0r ro system
what is ur tds reading out tap?
?? anything over 80/90tds out tap i would go down the route of r o system
my tap water is 50/60 use to have 2 di vessils witch lasted a while... i use 600 litres a day
but now got a 350 gpd ro producing 450 litres in 24 hours......... no resin