Index: firmware/App/Controllers/ConcentratePumps.h
===================================================================
diff -u -rf2b23abd44f71103b3ef6b0a96f18cc82d263735 -r352df4446493c8e071cc8e05fca8f191ac1bfba7
--- firmware/App/Controllers/ConcentratePumps.h	(.../ConcentratePumps.h)	(revision f2b23abd44f71103b3ef6b0a96f18cc82d263735)
+++ firmware/App/Controllers/ConcentratePumps.h	(.../ConcentratePumps.h)	(revision 352df4446493c8e071cc8e05fca8f191ac1bfba7)
@@ -33,7 +33,7 @@
 #ifdef __DIENER_CONC_PUMP__
 // For 100 RPM, Diener pump delivers 40ml/min,so restricing 300 RPM for now to maintain accuracy. We may allow up to 500 RPM
 // that yields 200 ml/min, but as speed increases, accuracy may drop.
-#define CONCENTRATE_PUMP_MAX_SPEED              120.0F              ///< Optimal speed for concentrate pump in mL/min
+#define CONCENTRATE_PUMP_MAX_SPEED              60.0F               ///< Optimal speed for concentrate pump in mL/min
 #define UF_PUMP_SPEED                           100.0F              ///< 100 ml/min, runs at 250 RPM
 #else
 #define CONCENTRATE_PUMP_MAX_SPEED              48.0F               ///< Maximum speed for concentrate pump in mL/min