CR Spotless Water System (300 Gallon)

[IID]

I'm going to be ordering the CR Spotless Water system but was curious if anyone else has/uses this system(300 gallon)?
How many rinses/washes will I get before I have to change the cartridge/resin ??

I know it depends how hard my water is and how much I use during rinse/washing but just looking for a rough estimate.

Thanks

 

[ObsessiveAutoDetail]

I don't wash with it... just rinse. It goes A LOT further...

 

[IID]

I don't wash with it... just rinse. It goes A LOT further...

Yes,I thought of that.
Do you also use the DIC-20 (300 gallon)?
If so,can you tell me how many rinses before cartridge/resin change?