First, I would check the output of the shower sump pump vs its stated capacity. Most shower sump systems pump 500 or 750 gph. Just get a 2 gallon bucket and time how long it takes to pump out 2 gallons.
If it's a 500 gph pump and it only pumps 200 gph, then troubleshoot it. I doubt the original build had a shower sump that had less capacity than the freshwater system. Most freshwater systems pump a maximum of 3 to 3.5 gpm. That's only 180-210 gph. Dennis C. Touche' 35-1 #83 Mandeville, LA
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