diff --git a/advanced-reactor.html b/advanced-reactor.html
index f6bedc9..d63f531 100644
--- a/advanced-reactor.html
+++ b/advanced-reactor.html
@@ -4,12 +4,38 @@
         color: '#c4cce0',
         defaults: {
             name: { value: "" },
+            volume: { value: 0., required: true},
+            S_O_init: { value: 0., required: true },
+            S_I_init: { value: 30., required: true },
+            S_S_init: { value: 100., required: true },
+            S_NH_init: { value: 16., required: true },
+            S_N2_init: { value: 0., required: true },
+            S_NO_init: { value: 0., required: true },
+            S_HCO_init: { value: 5., required: true },
+            X_I_init: { value: 25., required: true },
+            X_S_init: { value: 75., required: true },
+            X_H_init: { value: 30., required: true },
+            X_STO_init: { value: 0., required: true },
+            X_A_init: { value: 0.001, required: true },
+            X_TS_init: { value: 125., required: true }
         },
         inputs: 1,
         outputs: 1,
         icon: "font-awesome/fa-recycle",
         label: function() {
             return this.name||"advanced-reactor";
+        },
+        oneditprepare: function() {
+            $(".typed-num").typedInput({
+                type:"num",
+                types:["num"]
+            });
+        },
+        oneditsave: function() {
+            let volume = parseFloat($("#node-input-volume").typedInput("value"));
+            if (isNaN(volume) || volume <= 0) {
+                RED.notify("Fluid volume not set correctly", {type: "error"});
+            }
         }
     });
 </script>
@@ -19,6 +45,65 @@
         <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
         <input type="text" id="node-input-name" placeholder="Name">
     </div>
+    <h2> Reactor properties </h2>
+    <div class="form-row">
+        <label for="node-input-volume"><i class="fa fa-tag"></i> Fluid volume [m3]</label>
+        <input type="text" id="node-input-volume" class="typed-num" placeholder="m3">
+    </div>
+    <h2> Dissolved components </h2>
+    <div class="form-row">
+        <label for="node-input-S_O_init"><i class="fa fa-tag"></i> Initial dissolved oxygen [g O2 m-3]</label>
+        <input type="text" id="node-input-S_O_init">
+    </div>
+    <div class="form-row">
+        <label for="node-input-S_I_init"><i class="fa fa-tag"></i> Initial soluble inert  organics [g COD m-3]</label>
+        <input type="text" id="node-input-S_I_init" class="typed-num">
+    </div>
+    <div class="form-row">
+        <label for="node-input-S_S_init"><i class="fa fa-tag"></i> Initial readily biodegrable substrates [g COD m-3]</label>
+        <input type="text" id="node-input-S_S_init" class="typed-num">
+    </div>
+    <div class="form-row">
+        <label for="node-input-S_NH_init"><i class="fa fa-tag"></i> Initial ammonium / ammonia [g N m-3]</label>
+        <input type="text" id="node-input-S_NH_init" class="typed-num">
+    </div>
+    <div class="form-row">
+        <label for="node-input-S_N2_init"><i class="fa fa-tag"></i> Initial dinitrogen, released by denitrification [g N m-3]</label>
+        <input type="text" id="node-input-S_N2_init" class="typed-num">
+    </div>
+    <div class="form-row">
+        <label for="node-input-S_NO_init"><i class="fa fa-tag"></i> Initial nitrite + nitrate [g N m-3]</label>
+        <input type="text" id="node-input-S_NO_init" class="typed-num">
+    </div>
+    <div class="form-row">
+        <label for="node-input-S_HCO_init"><i class="fa fa-tag"></i> Initial alkalinity, bicarbonate [mole HCO3- m-3]</label>
+        <input type="text" id="node-input-S_HCO_init" class="typed-num">
+    </div>
+    <h2> Particulate components </h2>
+    <div class="form-row">
+        <label for="node-input-X_I_init"><i class="fa fa-tag"></i> Initial inert particulate organics [g COD m-3]</label>
+        <input type="text" id="node-input-X_I_init" class="typed-num">
+    </div>
+    <div class="form-row">
+        <label for="node-input-X_S_init"><i class="fa fa-tag"></i> Initial slowly biodegrable substrates [g COD m-3]</label>
+        <input type="text" id="node-input-X_S_init" class="typed-num">
+    </div>
+    <div class="form-row">
+        <label for="node-input-X_H_init"><i class="fa fa-tag"></i> Initial heterotrophic biomass [g COD m-3]</label>
+        <input type="text" id="node-input-X_H_init" class="typed-num">
+    </div>
+    <div class="form-row">
+        <label for="node-input-X_STO_init"><i class="fa fa-tag"></i> Initial Organics stored by heterotrophs [g COD m-3]</label>
+        <input type="text" id="node-input-X_STO_init" class="typed-num">
+    </div>
+    <div class="form-row">
+        <label for="node-input-X_A_init"><i class="fa fa-tag"></i> Initial autotrophic, nitrifying biomass [g COD m-3]</label>
+        <input type="text" id="node-input-X_A_init" class="typed-num">
+    </div>
+    <div class="form-row">
+        <label for="node-input-X_TS_init"><i class="fa fa-tag"></i> Initial total suspended solids [g TSS m-3]</label>
+        <input type="text" id="node-input-X_TS_init" class="typed-num">
+    </div>
 </script>
 
 <script type="text/html" data-help-name="advanced-reactor">
diff --git a/advanced-reactor.js b/advanced-reactor.js
index 1cd3e21..20d6081 100644
--- a/advanced-reactor.js
+++ b/advanced-reactor.js
@@ -7,7 +7,24 @@ module.exports = function(RED) {
 
         const Reactor = require('./dependencies/reactor_class');
 
-        const reactor = new Reactor(Array(13).fill(0.001));
+        const reactor = new Reactor(
+            config.volume,
+            [
+                config.S_O_init,
+                config.S_I_init,
+                config.S_S_init,
+                config.S_NH_init,
+                config.S_N2_init,
+                config.S_NO_init,
+                config.S_HCO_init,
+                config.X_I_init,
+                config.X_S_init,
+                config.X_H_init,
+                config.X_STO_init,
+                config.X_A_init,
+                config.X_TS_init
+            ]
+        );
 
         node.on('input', function(msg, send, done) {
             if (msg.topic == "clock") {
diff --git a/dependencies/reactor_class.js b/dependencies/reactor_class.js
index 8c69516..80aa3b6 100644
--- a/dependencies/reactor_class.js
+++ b/dependencies/reactor_class.js
@@ -3,12 +3,12 @@ const math = require('mathjs')
 
 class Reactor_CSTR {
     
-    constructor(initial_state) {
+    constructor(volume, initial_state) {
         this.state = initial_state;
         console.log(this.state);
         this.asm = new ASM3();
 
-        this.Vl = 10.0; // fluid volume reactor [m3]
+        this.Vl = volume; // fluid volume reactor [m3]
         this.F = 1.0; // fluid debit [m3 d-1]
         this.C_in = [0., 30., 100., 16., 0., 0., 5., 25., 75., 30., 0., 0., 125.]; // composition influent
         this.OTR = 100.0; // oxygen transfer rate [g O2 d-1]