Index: firmware/App/Controllers/ConcentratePumps.c
===================================================================
diff -u -rb6d20d9e5c704a9f7ebceea9bb12731dac61fc2a -rb43c9f8a4e0338eed6c2f4b48740fc60d74deeb6
--- firmware/App/Controllers/ConcentratePumps.c	(.../ConcentratePumps.c)	(revision b6d20d9e5c704a9f7ebceea9bb12731dac61fc2a)
+++ firmware/App/Controllers/ConcentratePumps.c	(.../ConcentratePumps.c)	(revision b43c9f8a4e0338eed6c2f4b48740fc60d74deeb6)
@@ -50,7 +50,7 @@
 #define CONCENTRATE_PUMP_HALL_SENSORS_OUT_OF_RANGE_TIME_MS  ( 5 * MS_PER_SECOND )                               ///< Hall sensors out of range time in milliseconds.
 
 #define CONCENTRATE_PUMP_MICRO_STEPS_PER_STEP               8.0F                                                ///< Number of micro-steps ( fractions of step) per step.
-#define CONCENTRATE_PUMP_STEP_PERIOD_RESOLUTION             ( 0.5F / ( US_PER_SECOND * SEC_PER_MIN ) )          ///< Convert step period resolution (0.5 us) to minute.
+#define CONCENTRATE_PUMP_STEP_PERIOD_RESOLUTION             ( 0.25F / ( US_PER_SECOND * SEC_PER_MIN ) )          ///< Convert step period resolution (0.25 us) to minute.
 
 /// Volume output per pulse.
 #define CONCENTRATE_PUMP_VOLUME_PER_PULSE                   ( CONCENTRATE_PUMP_VOLUME_PER_REV / CONCENTRATE_PUMP_PULSE_PER_REV )