water softener gpm

I am looking at two different systems that look like they should be speced about the same, but they have a major discrepancy in their max capacity Fleck 5600SXT Digital Metered Valve with 10x54" 48k grain tank...

Hello knowledgeable members... 5 years ago we replaced our old Fleck 5600 (20 yrs old; resin tank inside brine reservoir) with Aquasana's whole house filter and salt-free water softener. The resin had worn out and I was tired of replacing pistons, rings and/or valves every other year. BUT, more...