Old 2nd Apr 2021, 06:14
  #3 (permalink)  
Andrewgr2
 
Join Date: Jul 2008
Location: Only occasionally above FL50
Age: 68
Posts: 135
The brine outlet from my under sink water softener rises and connects above the trap under the sink - as does the dishwasher. Both eject waste water under pressure so ‘going uphill’ is not a problem. Both have worked fine for 9 years.
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