Rw15 incredibly noisy

[Tmmste]

Just received 2x rw15 from fishstreet. I have a very positive experience with the older rw20 and wp40. Strong, but silent.

So I just installend the rw15.. sounds horrible.. BrrrRrrRrrRrr... i cannot stand the noise and reinstalled my wp40 for the tike being. What happened?

Do shops sell look-a-like rw15? I cannot believe what I am hearing.. like my neighbor is drilling holes in the wall.. i checked the pumps.. brushed of any small particles.. also tried some petrolium gelly on the rotor.. did not help.
Also contacted the supplier fishstreet.. this is not normal.

 

[AllSignsPointToFish]

Sounds like the ceramic bearing may be having issues. If you disassemble the pump and inspect the bearing, at least you could rule that out.