Vortex Diatom Filter Problems

[Rod Hanks <rhanks at benchbuilt_com>]

I bought a Vortex Model XL (the big one) Diatom Filter at the
LFS (I was having an Ich outbreak).  Set it up and let it run.
It ran for 9 hours till 1:30 in the morning, when it started
making a high-pitched screeching noise, that setup off the
glass-breaks in my burglar alarm.

I went back to my LFS and they traded out the one I bought
for a new one (very nice people).  Set it up and let it
run.  NOT OVERNIGHT.  It ran the first evening for 4 or
5 hours okay.  Next morning I started it up again.  It ran
from 8 in the morning till 5 in the evening.  Then it started
making a high-pitched screeching noise.

People use these filters all the time.  I have one of the smaller
models that I have used for about 15 years.  There must be
something I am missing here.  Any ideas?

Thanks
Rod

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