Tunze Nano Streams

[fencer]

I have some used Tunzes. They work fine. I did inspect the shaft and the magnetic core. The shaft appears to be rusting. There seems to be some wear to one side of the core as well. Hydors I have had for 4 months(new) and the shafts are starting to corrode too but cores are not wearing. The wear problem is a design flaw in the Tunze. In Hydors the shaft is stablized on both ends and tunze only on one end(at least the ones I have) So my point is if the tunzes become unbalance wear quickly results. I had both on a wave maker and each time the tunzes started up it would make the worst noise. The hydor signifigantly less. Oh yes, the mounting bracket stubs on tunzes fracture very easily.