diff --git a/additional_nodes/recirculation-pump.html b/additional_nodes/recirculation-pump.html
index 2027a17..52f94a6 100644
--- a/additional_nodes/recirculation-pump.html
+++ b/additional_nodes/recirculation-pump.html
@@ -26,11 +26,11 @@
         },
         oneditsave: function() {
             let debit = parseFloat($("#node-input-F2").typedInput("value"));
-            if (isNaN(volume) || debit < 0) {
+            if (isNaN(debit) || debit < 0) {
                 RED.notify("Debit is not set correctly", {type: "error"});
             }
             let inlet = parseInt($("#node-input-n_inlets").typedInput("value"));
-            if (isNaN(inlet) || inlet < 1) {
+            if (inlet < 1) {
                 RED.notify("Number of inlets not set correctly", {type: "error"});
             }
         }
diff --git a/additional_nodes/recirculation-pump.js b/additional_nodes/recirculation-pump.js
index 472c7cc..489df01 100644
--- a/additional_nodes/recirculation-pump.js
+++ b/additional_nodes/recirculation-pump.js
@@ -15,10 +15,10 @@ module.exports = function(RED) {
                     let F_diff = Math.max(F1 - F2, 0);
                     let F2_corr = F1 < F2 ? F1 : F2;
 
-                    let msg_F1 = {...msg};
+                    let msg_F1 = structuredClone(msg);
                     msg_F1.payload.F = F_diff;
 
-                    let msg_F2 = structuredClone(msg);
+                    let msg_F2 = {...msg};
                     msg_F2.payload.F = F2_corr;
                     msg_F2.payload.inlet = inlet_F2;
 
diff --git a/additional_nodes/settling-basin.html b/additional_nodes/settling-basin.html
new file mode 100644
index 0000000..da614bc
--- /dev/null
+++ b/additional_nodes/settling-basin.html
@@ -0,0 +1,57 @@
+<script type="text/javascript">
+    RED.nodes.registerType("settling-basin", {
+        category: "WWTP",
+        color: "#e4a363",
+        defaults: {
+            name: { value: "" },
+            SVI: { value: 0.1, required: true },
+            inlet: { value: 1, required: true }
+        },
+        inputs: 1,
+        outputs: 2,
+        outputLabels: ["Main effluent", "Sludge effluent"],
+        icon: "font-awesome/fa-random",
+        label: function() {
+            return this.name || "Settling basin";
+        },
+        oneditprepare: function() {
+            $("#node-input-SVI").typedInput({
+                type:"num",
+                types:["num"]
+            });
+            $("#node-input-inlet").typedInput({
+                type:"num",
+                types:["num"]
+            });
+        },
+        oneditsave: function() {
+            let SVI = parseFloat($("#node-input-SVI").typedInput("value"));
+            if (isNaN(SVI) || SVI < 0) {
+                RED.notify("SVI is not set correctly", {type: "error"});
+            }
+            let inlet = parseInt($("#node-input-n_inlets").typedInput("value"));
+            if (inlet < 1) {
+                RED.notify("Number of inlets not set correctly", {type: "error"});
+            }
+        }
+    });
+</script>
+
+<script type="text/html" data-template-name="settling-basin">
+    <div class="form-row">
+        <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
+        <input type="text" id="node-input-name" placeholder="Name">
+    </div>
+    <div class="form-row">
+        <label for="node-input-SVI"><i class="fa fa-tag"></i> SVI (alternate)</label>
+        <input type="text" id="node-input-SVI" placeholder="">
+    </div>
+    <div class="form-row">
+        <label for="node-input-inlet"><i class="fa fa-tag"></i> Assigned inlet return line</label>
+        <input type="text" id="node-input-inlet" placeholder="#">
+    </div>
+</script>
+
+<script type="text/html" data-help-name="settling-basin">
+    <p>Settling tank</p>
+</script>
diff --git a/additional_nodes/settling-basin.js b/additional_nodes/settling-basin.js
new file mode 100644
index 0000000..f012b81
--- /dev/null
+++ b/additional_nodes/settling-basin.js
@@ -0,0 +1,53 @@
+module.exports = function(RED) {
+    function settler(config) {
+        RED.nodes.createNode(this, config);
+        var node = this;
+
+        let name = config.name;
+        let SVI = parseFloat(config.SVI);
+        const inlet_sludge = parseInt(config.inlet);
+
+        node.on('input', function(msg, send, done) {
+            switch (msg.topic) {
+                case "Fluent":
+                    // conserve volume flow debit
+                    let F_in = msg.payload.F;
+                    let C_in = msg.payload.C;
+                    let X_in = (C_in[7] + C_in[8] + C_in[9] + C_in[10] + C_in[11] + C_in[12]);
+                    let F2 = (F_in * X_in) / (SVI*1000*1000);
+
+                    let msg_F1 = structuredClone(msg);
+                    msg_F1.payload.F = F_in - F2;
+                    msg_F1.payload.C[7] = 0;
+                    msg_F1.payload.C[8] = 0;
+                    msg_F1.payload.C[9] = 0;
+                    msg_F1.payload.C[10] = 0;
+                    msg_F1.payload.C[11] = 0;
+                    msg_F1.payload.C[12] = 0;
+
+                    let msg_F2 = {...msg};
+                    msg_F2.payload.F = F2;
+                    if (F2 != 0) {
+                        msg_F2.payload.C[7] = F_in * C_in[7] / F2;
+                        msg_F2.payload.C[8] = F_in * C_in[8] / F2;
+                        msg_F2.payload.C[9] = F_in * C_in[9] / F2;
+                        msg_F2.payload.C[10] = F_in * C_in[10] / F2;
+                        msg_F2.payload.C[11] = F_in * C_in[11] / F2;
+                        msg_F2.payload.C[12] = F_in * C_in[12] / F2;
+                    }
+                    msg_F2.payload.inlet = inlet_sludge;
+
+                    send([msg_F1, msg_F2]);
+                    break;
+                default:
+                    console.log("Unknown topic: " + msg.topic);
+            }
+
+            if (done) {
+                done();
+            }
+        });
+
+    }
+    RED.nodes.registerType("settling-basin", settler);
+};
diff --git a/package.json b/package.json
index 59c69a7..e60fa97 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,8 @@
   "node-red": {
     "nodes": {
       "advanced-reactor": "advanced-reactor.js",
-      "recirculation-pump": "additional_nodes/recirculation-pump.js"
+      "recirculation-pump": "additional_nodes/recirculation-pump.js",
+      "settling-basin": "additional_nodes/settling-basin.js"
     }
   },
   "dependencies": {