Mar 10, 2016 - 04:16 AM
You only need 1 bag.
Here are the instructions on refilling the softener with resin --> http://www.rvupgradestore.com/v/vspfiles/assets/pdf/RESINREPLACEMENTINSTRUCTION
The thing to remember is that you will need to have the distribution tub installed on the head of the tank and the head screwed in place before dumping the resin into the tank. Otherwise it will damage the distribution tube as you screw the head on. You will dump the resin through the fill port which will require a small funnel.