Elsil test strips
Test strips are a quick, inexpensive way of monitoring the safety of aircraft drinking water and should be used periodically to ensure the correct dosing levels are being maintained.

When a strip is dipped directly into the bowser, the colour of the tip changes immediately and it can then be compared to the chart and further Elsil added as required.

Elsil Automatic Dosing Unit
Highly accurate, automatic dosing unit supplied with Elsil bulk fluid to assist with the uplifting and sterilisation of aircraft drinking water