Need help sizing water softener system
I read many useful information from this forum regarding Water softener system. I have never use water softener system before but will need one installed for my tankless water heater.
I'll need help in size/type of the system & type of controller I should get.
Water supply - city water
people in house - 3 adults, townhouse
bathroom - 3 washrooms; 2 baths
Flow rate (hot & cold taps full open) - 13.21 gpm
Information from town :
Water hardness - 7.26 gpg
Coliform - 0-1 (min# - max#)
Chlorine - 0.26-1.29 mg/L (min# - max#)
Mercury - Selenium - Uranium - 0.0003 mg/L
Nitrite - Nitrate - 0.468 mg/L
Lead at distribution - 0.0001-0.0017 mg/L (min# - max#)
Sodium - 15.27 mg/L
PH - 7 to 8; ~ 7.6
Iron - non detacted
Manganese - non detacted
Copper - 0.032 mg/L
1. should I get rock base + resin or just the resin ?
2. Is there different type of resin available (any brand is of higher/better quality) in the market ? The salesman mentioned a "regular" resin and a "finer" resin.
Thank you for your help.