[jackson6745]

Jhale it does not appear to be rust more like some sort of oil. The SPS started acting "funny" since I noticed the pump becoming loud. I noticed small white spots on the tip of acros, some stn here and there, and poor night time polyp extension. The same thing happen when the mag drive fried my tank (mag drive was much worse)........and the water quality was where I want it to be.

Albert, you're right, Tunze products are usually high quality but I did a search on osmolators and many people seem to have problems with the pump failing. I don't care about spending $20 every 6 months to replace a pump but I don't want to continue to use the osmolator with the same pump if this could happen. Maybe i could use an ehem pump?? I'll have to ask Roger.

Mike it sucks because I like how precise and reliable the sensors are on the osmolator but this pump really is ghetto. For the money spent on this thing it should come with a better pump.