diff -r 3b9e4dfb0476 -r 6428dae0605d www/js/rec_edit.js
--- a/www/js/rec_edit.js	Sun Dec 30 22:01:27 2018 +0100
+++ b/www/js/rec_edit.js	Mon Dec 31 14:41:08 2018 +0100
@@ -2633,7 +2633,7 @@
 
 	$("#sparge_temp").jqxNumberInput({ inputMode: 'simple', spinMode: 'simple', theme: theme, width: 100, height: 23, min: 70, max: 98, decimalDigits: 1, spinButtons: true, spinButtonsStep: 0.5 });
 	$("#sparge_volume").jqxNumberInput({ inputMode: 'simple', spinMode: 'simple', theme: theme, width: 100, height: 23, decimalDigits: 1, spinButtons: true, spinButtonsStep: 0.1 });
-	$("#sparge_ph").jqxNumberInput({ inputMode: 'simple', spinMode: 'simple', theme: theme, width: 100, height: 23, decimalDigits: 1, spinButtons: true, spinButtonsStep: 0.1 });
+	$("#sparge_ph").jqxNumberInput({ inputMode: 'simple', spinMode: 'simple', theme: theme, width: 100, height: 23, min: 4.5, max: 6.5, decimalDigits: 1, spinButtons: true, spinButtonsStep: 0.1 });
 	$("#sparge_source").jqxDropDownList({ theme: theme, source: srcSource, width: 100, height: 23, dropDownHeight: 95 });
 	$("#sparge_acid_amount").jqxNumberInput({ inputMode: 'simple', theme: theme, width: 100, height: 23, decimalDigits: 2, readOnly: true, symbol: ' ml', symbolPosition: 'right' });
 	$("#sparge_acid_type").jqxDropDownList({ theme: theme, source: srcAcid, width: 100, height: 23, dropDownHeight: 128 });