[Nordic]

When the water level in my airtrap/res get below the intake, bubbles form from the splashing and get sucked into the system. When the bubbles pass the pump - they turn into foam. If that raises temperatures significantly, I'm not surprised, but I've never found out if it's significant before filling up the system.

What I've found is that an air-trap must be designed so that:

• the stream of water is not rippling the surface causing bubbles (low placement of intake helps)
• the path traveled by the stream inside the res is as long as is practically required (to prevent passing along the air bubbles)

FYI, I tried a "T" before I gave up and added the airtrap/res I have now. A "T" simply could not get rid of the air in my system and the pump would keep churning out foam. My "T" was placed before the intake of the pump and I guess that and the design of my system made that a bad combo, it has worked for others.