diff -r 37c2ac4c2118 -r f7201dc4c142 www/js/prod_edit.js
--- a/www/js/prod_edit.js	Mon Mar 16 21:09:49 2020 +0100
+++ b/www/js/prod_edit.js	Mon Mar 16 21:14:08 2020 +0100
@@ -2902,7 +2902,7 @@
   chloride += 1000 * RA / liters;
   // Einde noot.
 
-  if ($('#wa_acid_name').val() < 0 || $('#wa_acid_name').val() > 3) {
+  if (parseFloat($('#wa_acid_name').val()) < 0 || parseFloat($('#wa_acid_name').val()) > 3) {
    $('#wa_acid_name').val(0);
    dataRecord.wa_acid_name = 0;
   }
@@ -2910,7 +2910,7 @@
   if (last_acid == '')
    last_acid = AcidTypeData[$('#wa_acid_name').val()].nl;
 
-  if ($('#wa_base_name').val() < 0 || $('#wa_base_name').val() > 3) {
+  if (parseFloat($('#wa_base_name').val()) < 0 || parseFloat($('#wa_base_name').val()) > 3) {
    $('#wa_base_name').val(0);
    dataRecord.wa_base_name = 0;
   }