About a month and a half ago I upgraded my return pump to an Eheim 1262. I had been using two 802 power heads for return pumps from my sump. The flow with the powerheads seemed decent enough. However, it was not enough to sweep all the bubbles out of my overflow tube. This was especially true when algae started growing in there. On a few occasions enough air accumulated in the tube to severely reduce the flow. This would result in the level in my tank rising to counteract the reduced flow. There were two or three times when the center brace of my tank ended up underwater.
It seems somewhat counter-intuitive but increasing the capacity of your pump actually reduces the probability of an overflow disaster. The new pump is powerful enough that small bubbles are swept out of the overflow tube. Since getting this pump I have yet to see even a small bubble at the top pf the tube. I no longer have to worry about an overflow occurring through this mechanism.
The pump, although expensive, is great. It is extremely quiet. I simply cannot hear it run. All I here is the relaxing sound of water flowing through my system.
dreams of snow pond...
6 years ago