diff --git a/advanced-reactor.html b/advanced-reactor.html
index 5b4d41b..512f3dd 100644
--- a/advanced-reactor.html
+++ b/advanced-reactor.html
@@ -40,6 +40,14 @@
                 type:"num",
                 types:["num"]
             });
+            $("#node-input-length").typedInput({
+                type:"num",
+                types:["num"]
+            });
+            $("#node-input-resolution_L").typedInput({
+                type:"num",
+                types:["num"]
+            });
             $("#node-input-kla").typedInput({
                 type:"num",
                 types:["num"]
diff --git a/advanced-reactor.js b/advanced-reactor.js
index 68e9674..8348137 100644
--- a/advanced-reactor.js
+++ b/advanced-reactor.js
@@ -5,13 +5,13 @@ module.exports = function(RED) {
 
         let name = config.name;
 
-        const Reactor = require('./dependencies/reactor_class');
+        const { Reactor_CSTR, Reactor_PFR } = require('./dependencies/reactor_class');
 
         let new_reactor;
 
         switch (config.reactor_type) {
             case "CSTR":
-                new_reactor = new Reactor(
+                new_reactor = new Reactor_CSTR(
                     parseFloat(config.volume),
                     parseInt(config.n_inlets),
                     parseFloat(config.kla),
@@ -33,9 +33,9 @@ module.exports = function(RED) {
                 );
                 break;
             case "PFR":
-                new_reactor = new Reactor(
+                new_reactor = new Reactor_PFR(
                     parseFloat(config.volume),
-                    parseFloat(config.L),
+                    parseFloat(config.length),
                     parseInt(config.resolution_L),
                     parseInt(config.n_inlets),
                     parseFloat(config.kla),
diff --git a/dependencies/reactor_class.js b/dependencies/reactor_class.js
index af3289e..4027690 100644
--- a/dependencies/reactor_class.js
+++ b/dependencies/reactor_class.js
@@ -87,16 +87,19 @@ class Reactor_PFR {
         this.A = volume / length; // crosssectional area [m2]
 
         this.state = Array.from(Array(this.n_x), () => initial_state.slice())
+        
+        // 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.D = 0.1; // 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.timeStep = 1/(24*60*60); // time step [d]
         this.speedUpFactor = 1;
 
         this.D_op = this.makeDoperator();
@@ -118,7 +121,7 @@ class Reactor_PFR {
     }
 
     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};
+        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
@@ -145,10 +148,10 @@ class Reactor_PFR {
     tick_fe(time_step) { // tick reactor state using forward Euler method
         const dispersion = math.multiply(this.D / (this.d_x*this.d_x), this.D2_op, this.state);
         const advection = math.multiply(math.sum(this.Fs)/(this.A*this.d_x), this.D_op, this.state);
-        const reaction = this.state.map((row) => this.asm.compute_dC(row));
+        const reaction = this.state.map((state_slice) => this.asm.compute_dC(state_slice));
         reaction[0] = Array(13).fill(0.0);
         const transfer = Array.from(Array(this.n_x), () => new Array(13).fill(0.0));
-
+        
         if (isNaN(this.kla)) { // calculate OTR if kla is not NaN, otherwise use externally calculated OTR
             transfer.forEach((x) => { x[0] = this.OTR; });
         } else {
@@ -202,4 +205,4 @@ class Reactor_PFR {
 //     N += 1;
 // }
 
-module.exports = Reactor_CSTR;
\ No newline at end of file
+module.exports = {Reactor_CSTR, Reactor_PFR};
\ No newline at end of file