diff --git a/additional_nodes/recirculation-pump.html b/additional_nodes/recirculation-pump.html
index 52f94a6..39a3753 100644
--- a/additional_nodes/recirculation-pump.html
+++ b/additional_nodes/recirculation-pump.html
@@ -43,7 +43,7 @@
         <input type="text" id="node-input-name" placeholder="Name">
     </div>
     <div class="form-row">
-        <label for="node-input-F2"><i class="fa fa-tag"></i> Recirculation debit [m3 s-1]</label>
+        <label for="node-input-F2"><i class="fa fa-tag"></i> Recirculation debit [m3 d-1]</label>
         <input type="text" id="node-input-F2" placeholder="m3 s-1">
     </div>
     <div class="form-row">
diff --git a/additional_nodes/recirculation-pump.js b/additional_nodes/recirculation-pump.js
index 489df01..cd9fc21 100644
--- a/additional_nodes/recirculation-pump.js
+++ b/additional_nodes/recirculation-pump.js
@@ -11,12 +11,12 @@ module.exports = function(RED) {
             switch (msg.topic) {
                 case "Fluent":
                     // conserve volume flow debit
-                    let F1 = msg.payload.F;
-                    let F_diff = Math.max(F1 - F2, 0);
-                    let F2_corr = F1 < F2 ? F1 : F2;
+                    let F_in = msg.payload.F;
+                    let F1 = Math.max(F_in - F2, 0);
+                    let F2_corr = F_in < F2 ? F_in : F2;
 
                     let msg_F1 = structuredClone(msg);
-                    msg_F1.payload.F = F_diff;
+                    msg_F1.payload.F = F1;
 
                     let msg_F2 = {...msg};
                     msg_F2.payload.F = F2_corr;
diff --git a/additional_nodes/settling-basin.html b/additional_nodes/settling-basin.html
index da614bc..e8e8e8d 100644
--- a/additional_nodes/settling-basin.html
+++ b/additional_nodes/settling-basin.html
@@ -4,7 +4,7 @@
         color: "#e4a363",
         defaults: {
             name: { value: "" },
-            SVI: { value: 0.1, required: true },
+            TS_set: { value: 0.1, required: true },
             inlet: { value: 1, required: true }
         },
         inputs: 1,
@@ -15,7 +15,7 @@
             return this.name || "Settling basin";
         },
         oneditprepare: function() {
-            $("#node-input-SVI").typedInput({
+            $("#node-input-TS_set").typedInput({
                 type:"num",
                 types:["num"]
             });
@@ -25,9 +25,9 @@
             });
         },
         oneditsave: function() {
-            let SVI = parseFloat($("#node-input-SVI").typedInput("value"));
-            if (isNaN(SVI) || SVI < 0) {
-                RED.notify("SVI is not set correctly", {type: "error"});
+            let TS_set = parseFloat($("#node-input-TS_set").typedInput("value"));
+            if (isNaN(TS_set) || TS_set < 0) {
+                RED.notify("TS is not set correctly", {type: "error"});
             }
             let inlet = parseInt($("#node-input-n_inlets").typedInput("value"));
             if (inlet < 1) {
@@ -43,8 +43,8 @@
         <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="">
+        <label for="node-input-TS_set"><i class="fa fa-tag"></i> Total Solids set point [g m-3]</label>
+        <input type="text" id="node-input-TS_set" placeholder="">
     </div>
     <div class="form-row">
         <label for="node-input-inlet"><i class="fa fa-tag"></i> Assigned inlet return line</label>
diff --git a/additional_nodes/settling-basin.js b/additional_nodes/settling-basin.js
index f012b81..e19457a 100644
--- a/additional_nodes/settling-basin.js
+++ b/additional_nodes/settling-basin.js
@@ -4,7 +4,7 @@ module.exports = function(RED) {
         var node = this;
 
         let name = config.name;
-        let SVI = parseFloat(config.SVI);
+        let TS_set = parseFloat(config.TS_set);
         const inlet_sludge = parseInt(config.inlet);
 
         node.on('input', function(msg, send, done) {
@@ -13,11 +13,13 @@ module.exports = function(RED) {
                     // 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 F2 = (F_in * C_in[12]) / TS_set;
+
+                    let F1 = Math.max(F_in - F2, 0);
+                    let F2_corr = F_in < F2 ? F_in : F2;
 
                     let msg_F1 = structuredClone(msg);
-                    msg_F1.payload.F = F_in - F2;
+                    msg_F1.payload.F = F1;
                     msg_F1.payload.C[7] = 0;
                     msg_F1.payload.C[8] = 0;
                     msg_F1.payload.C[9] = 0;
@@ -26,8 +28,8 @@ module.exports = function(RED) {
                     msg_F1.payload.C[12] = 0;
 
                     let msg_F2 = {...msg};
-                    msg_F2.payload.F = F2;
-                    if (F2 != 0) {
+                    msg_F2.payload.F = F2_corr;
+                    if (F2_corr > 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;