diff --git a/src/specificClass.js b/src/specificClass.js
index 44f41af..3f62914 100644
--- a/src/specificClass.js
+++ b/src/specificClass.js
@@ -76,9 +76,11 @@ class Reactor {
     const Cs = isArray(this.state.at(-1)) ? this.state.at(-1) : this.state;
     const effluent = [{ topic: "Fluent", payload: { inlet: 0, F: math.sum(this.Fs), C: Cs }, timestamp: this.currentTime }];
     if (this.returnPump) {
-      const recirculationFlow = this.returnPump.measurements.type("flow").variant("measured").position("atEquipement").getCurrentValue();
-      effluent[0].F -= recirculationFlow || 0;
-      effluent.push({ topic: "Fluent", payload: { inlet: 1, F: recirculationFlow, C: Cs }, timestamp: this.currentTime });
+      const recirculationFlow = this.returnPump.measurements.type("flow").variant("measured").position("atequipment").getCurrentValue();
+      const F_main = Math.max(effluent[0].payload.F - recirculationFlow, 0);
+      const F_side_constrained = effluent[0].payload.F < recirculationFlow ? effluent[0].payload.F : recirculationFlow;
+      effluent[0].payload.F = F_main;
+      effluent.push({ topic: "Fluent", payload: { inlet: 1, F: F_side_constrained, C: Cs }, timestamp: this.currentTime });
     }
     return effluent;
   }