I have used the TravelSoft 1200 Portable Water Softener for 10 years now.
I have modified the unit in a way to extend the recharging cycle. I accomplished that by installing additional resin beads where the salt would normally reside leaving about 1-2 inches at the top of the tank with just enough room for the resin beads to fluff up when back-washing.
I then take a clear house water filter cartridge holder and fill it full with the solar salt crystals and attach it to the input side of the water softener. I turn the filter upside down and run a very slow trickle of water through the filter holder and into the softener. The output side is temporarily plumbed into the sewer drain. I wait until 99% of the salt has dissolved and repeat the process with three more cartridge fulls of solar salt. Once I have "charged" the resin beads, I remove the filter holder and hook everything back up and run water through the softener for another 2-3 minutes to get rid of the salt concentrate. The last thing I do is hook the output side back up to the coach.
That recharge cycle last us about 2 weeks where we are currently staying as the water here is fairly hard but other places we have been able to go as long as one month between charges.
As the previous poster stated, it a matter of how hard the water is and how much water is used along with the total capacity of the softener.
Dr4Film ----- Richard
2002 Monaco Windsor PBT 40Ft. (R HOME) - 30Ft. 2006 Pace Trailer (R JUNK). Trailer Has 06 VUE (R TOWD) 04 Victory Alen Ness Edition (R RYDE). Full-Timer for 14 Yr's BUT now a Part-Timer. Cummins ISC-350 With Banks Power Pack and Upgraded PRXB PacBrake.
Winter Home in Flagler Beach FL - Now Staying in Dansville NY for the Summer.