Dos awc

[Mrx7899]

My dos was a little out of calibration it was taking out more then it was putting back in. I recalibrated it a couple times last night and now my new saltwater head is running about 3 seconds longer then the other head. I've been doing awc for 2 years and they've stopped pretty much at the same time. Is it possible the the new saltwater head is slowing down. Anyone else else have one that does this ? Thanks

 

[Reefing Madness]

 

[Unthinkable]

If calibration is not helping, you probably need new heads. When was the last time you changed them?

 

[Mrx7899]

They are almost a year old I buy a new set every Christmas. I measured the output of each one and they are putting out pretty close to the same volume.