Gary Slusser
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They also list a few other things.Clack lists a 15lb service pressure drop for all three valves
The 1" flows 27 gpm, the 1.25 flows 34 gpm and the 1.50 flows 60 gpm.
As I've already said, the code calls for no reduction of the ID for the plumbing connections; not the control valve ID or the distributor tube. Possibly you neeed to look that up.If I recall correctly the cold water supply piping is 1 1/2 which by code dictates an 1 1/2 valve body.
Now we are talking half that; 20-22 gpm and 1.25" tubing.I also remember the SFU being around 44 gpm which is with both mega showers running at the same time, full bore.
IIRC he said every morning and I have many softeners in houses with this type shower being used every day and sometimes twice a day.Admittedly that scenario is probably the exception to the rule but it may happen occasionally. So the question is whether or not you go with a smaller valve and unit and occasional get some amount of hard water through the system or you go with a 1 1/2 valve and size for maximum volume.
Based on the regeneration schedule channeling will not be a problem.