My design has the kalk settling away from the pump, and it is quiet for about the first 3 months or so (new and after I've replaced the impellor). I've tried drilling out the impellor to replace the shaft, but I can't get it perfect.
Any suggestions for a ceramic shaft based powerhead?
Have you experienced any problems using the maxijet in terms of wearing out the propellor? I have a similar kalk reactor and my pump begins chattering after about 4 months of use. I only put about 1 cup of kalk in the chamber.
Matt