<a href=showthread.php?s=&postid=12482170#post12482170 target=_blank>Originally posted</a> by Jimbo327
I just tested the mechanical water changer, and it almost killed my tank. I wasn't paying attention, I just started it and went to grab some dinner. By the time I remember to check like an hour later, the salinity was at 1.019. :eek1:
I may need to do some refinement and bug check on this design. Not sure exactly what went wrong, I know it must have been the fresh saltwater not getting into the tank while the waste tankwater was being pumped out. Then my ATO kicked in to top it off, just doing its job.
So either the incoming and outgoing rates are different (which it shouldn't be, this is laboratory equipment). Or my hunch is that I must have pinched the incoming tube with my hood, or I need a check valve, or I need even smaller tubing.
I did a quick check with a graduated cylinder with both the outgoing and incoming tube in there. After 5 minutes, I didn't really see any significant drop or increase. So I think the pump is working as it should.