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Bottom posted.

- --
You can find my public key at https://keyserver1.pgp.com
"NetMax" wrote in message
...
being picky, no worries ). I'm still learning, and if hole
in the
impeller cover goes all the way through, then you definitely have a

point. I'm going to have to take a closer look at this next time I
have
one apart. The Fluval internals seemed to do this a lot to me
(impeller
shaft sliding down), but I never had complaints about it.

The situation of not starting after a power interruption is not
unique to
Hagen. It's more of a characteristic of magnetic impellers. The
force
required to spin them is much smaller than the force required to
start
them, so a bit of resistance from debris can cause them to not
start.
Ironically, I think this is partly by design as they made the
motors
smaller (cheaper, less heat generated, less electricity consumed).
When
magnetic impellers were invented (I was in the hobby then, as many
others
here) they were more powerful, so they rarely didn't restart from
debris,
but they often didn't restart because of alignment. Instead of a
well,
they used a platter, and the slightest misalignment would magnify
itself
and wear the blades down from rubbing. When they lost power, they
would
throw themselves over to a side so far as to not restart again. I

probably still have a box of impeller blades which have all been
slightly
modified for balance. We are relatively spoiled today ;~).
--
www.NetMax.tk



Thanks for sharing that netmax, I had been wondering about these
things - the lower power powerheads these days not starting sometimes
makes sense to me - after all - canister filters consume more energy
but practically always restart as soon as power is restored. Good
luck and later!

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