How to Clean

Follow these simple steps to clean gauge glass while steam pressure in on boiler and without disassembly.

1. Fill a cup with ordinary household ammonia.
2. Close top and bottom gauge valves. Open drain valve beneath column.
3. Barely open the top gauge valve so steam pressure blows all the water out the drain line and glass contains only steam.
4. With a very gentle flow of steam out of the drain line, hold cup of ammonia to the end of the drain line so steam bubbles up through ammonia.
5. Close top gauge valve. Steam will quickly condense in the gauge causing a vacuum. The resulting contraction will suck ammonia into the gauge glass.

Repeat until the gauge glass is sparkling clean.