diff --git a/src/reactor_class.js b/src/reactor_class.js
index c1e8989..a81ff7f 100644
--- a/src/reactor_class.js
+++ b/src/reactor_class.js
@@ -7,43 +7,56 @@ const config = {
 
 const math = create(all, config)
 
-class Reactor_CSTR {
-    
-    constructor(volume, n_inlets, kla, initial_state) {
-        this.state = initial_state;
+class Reactor {
+
+    constructor(volume, n_inlets, kla){
         this.asm = new ASM3();
 
         this.Vl = volume; // fluid volume reactor [m3]
+
         this.Fs = Array(n_inlets).fill(0.0); // fluid debits per inlet [m3 d-1]
         this.Cs_in = Array.from(Array(n_inlets), () => new Array(13).fill(0.0)); // composition influents
         this.OTR = 0.0; // oxygen transfer rate [g O2 d-1]
-        
+
         this.kla = kla; // if NaN, use external OTR [d-1]
 
         this.currentTime = Date.now(); // milliseconds since epoch [ms]
         this.timeStep = 1/(24*60*15); // time step [d]
-        this.speedUpFactor = 1;
+        this.speedUpFactor = 60;
     }
 
     set setInfluent(input) { // setter for C_in (WIP)
         let index_in = input.payload.inlet;
         this.Fs[index_in] = input.payload.F;
         this.Cs_in[index_in] = input.payload.C;
+        // console.log("Pe total " + this.length*math.sum(this.Fs)/(this.D*this.A));
+        // console.log("Pe local " + this.d_x*math.sum(this.Fs)/(this.D*this.A));
+        // console.log("Co ad " + math.sum(this.Fs)*this.timeStep/(this.A*this.d_x));
+        // console.log("Co D " + this.D*this.timeStep/(this.d_x*this.d_x));
     }
 
     set setOTR(input) { // setter for OTR (WIP) [g O2 d-1]
         this.OTR = input.payload;
     }
 
-    get getEffluent() { // getter for Effluent, defaults to inlet 0
-        return {topic: "Fluent", payload: {inlet: 0, F: math.sum(this.Fs), C:this.state}, timestamp: this.currentTime};
-    }
-
     calcOTR(S_O, T=20.0) { // caculate the OTR using basic correlation, default to temperature: 20 C
         let S_O_sat = 14.652 - 4.1022e-1*T + 7.9910e-3*T*T + 7.7774e-5*T*T*T;
         return this.kla * (S_O_sat - S_O);
     }
 
+}
+
+class Reactor_CSTR extends Reactor {
+    
+    constructor(volume, n_inlets, kla, initial_state) {
+        super(volume, n_inlets, kla);
+        this.state = initial_state;
+    }
+
+    get getEffluent() { // getter for Effluent, defaults to inlet 0
+        return {topic: "Fluent", payload: {inlet: 0, F: math.sum(this.Fs), C:this.state}, timestamp: this.currentTime};
+    }
+
     // expect update with timestamp
     updateState(newTime) {
 
@@ -75,12 +88,11 @@ class Reactor_CSTR {
     }
 }
 
-class Reactor_PFR {
+class Reactor_PFR extends Reactor {
     
     constructor(volume, length, resolution_L, n_inlets, kla, initial_state) {
-        this.asm = new ASM3();
+        super(volume, n_inlets, kla);
 
-        this.Vl = volume; // fluid volume reactor [m3]
         this.length = length; // reactor length [m]
         this.n_x = resolution_L; // number of slices
         this.d_x = length / resolution_L;
@@ -92,35 +104,12 @@ class Reactor_PFR {
         // console.log("Initial State: ")
         // console.log(this.state)
 
-        this.Fs = Array(n_inlets).fill(0.0); // fluid debits per inlet [m3 d-1]
-        this.Cs_in = Array.from(Array(n_inlets), () => new Array(13).fill(0.0)); // composition influents
-        this.OTR = 0.0; // oxygen transfer rate [g O2 d-1]
         this.D = 0.0; // axial dispersion [m2 d-1]
-        
-        this.kla = kla; // if NaN, use external OTR [d-1]
-
-        this.currentTime = Date.now(); // milliseconds since epoch [ms]
-        this.timeStep = 1/(24*60*15); // time step [d]
-        this.speedUpFactor = 60;
 
         this.D_op = this.makeDoperator(true, true);
         this.D2_op = this.makeD2operator();
     }
 
-    set setInfluent(input) { // setter for C_in (WIP)
-        let index_in = input.payload.inlet;
-        this.Fs[index_in] = input.payload.F;
-        this.Cs_in[index_in] = input.payload.C;
-        // console.log("Pe total " + this.length*math.sum(this.Fs)/(this.D*this.A));
-        // console.log("Pe local " + this.d_x*math.sum(this.Fs)/(this.D*this.A));
-        // console.log("Co ad " + math.sum(this.Fs)*this.timeStep/(this.A*this.d_x));
-        // console.log("Co D " + this.D*this.timeStep/(this.d_x*this.d_x));
-    }
-
-    set setOTR(input) { // setter for OTR (WIP) [g O2 d-1]
-        this.OTR = input.payload;
-    }
-
     set setDispersion(input) { // setter for Axial dispersion [m2 d-1]
         this.D = input.payload;
     }
@@ -129,11 +118,6 @@ class Reactor_PFR {
         return {topic: "Fluent", payload: {inlet: 0, F: math.sum(this.Fs), C:this.state.at(-1)}, timestamp: this.currentTime};
     }
 
-    calcOTR(S_O, T=20.0) { // caculate the OTR using basic correlation, default to temperature: 20 C
-        let S_O_sat = 14.652 - 4.1022e-1*T + 7.9910e-3*T*T + 7.7774e-5*T*T*T;
-        return this.kla * (S_O_sat - S_O);
-    }
-
     // expect update with timestamp
     updateState(newTime) {
         const day2ms = 1000 * 60 * 60 * 24;