In the 1970's, there was a siphon fed aquarium filter,
with a motor outside the aquarium, attached to the bottom of the filter
basket.The top of the filter basket held glass or polyester type filter
materials, with a following layer of water conditioning carbon pellets.The
return pump was at the bottom of the basket, with a magnet on the
impeller,driven by the magnet on the shaft of the bottom motor.
I noticed the next generation of that pump and filter in the 1980's, where the
filter basket was now inside the aquarium, so the error and disaster prone
siphon was replaced by a gap at the top of the filter basket.Again, the drive
mechanism of the filter was a motor outside the aquarium,driving a magnet on
the motor shaft, with a magnetic impeller driving the water through a pump in
the filter basket.
Both motor filters were outside the aquarium.Safety was the first reason for
putting the motor outside the aquarium.Given that the temperature of aquarium
fish is one thing you can change when you are trying to breed tropical fish, I
suggest that was a reason for isolating the possibly varying temperature of a
motor from the water of the aquarium.
I keep reminding myself of the magnetic coupled impeller,
when I think of glass or plastic, and things to do in water.
James Isaac.
On Wednesday, January 19, 2022, 07:25:09 p.m. EST, Chris Albertson
<albertson.ch...@gmail.com> wrote:
Advice from aquariu use. Place EVERYTHING inside the tank if you can,
filters and all. Leaks then don't make a mess, broken hoses don't make a
mess. Of course, you can not place the spindle motor in the tank but
assuming the motor is the only thing not in the tank, there are only two
connections that can leak.
That said, you would have never noticed the filters were leaking if they
were inside the tank.
Also, the downside of placing the pump in the tank is the pump will heat
the water. But maybe you don't run it enough to matter I was doing 8 or
12-hour runs.
On Wed, Jan 19, 2022 at 4:07 PM gene heskett <ghesk...@shentel.net> wrote:
> On Sunday, January 16, 2022 3:34:37 PM EST gene heskett wrote:
> replying to myself to issue a warning and a fix.
>
> > I just fired up the 6040 to make a pocket for a 3mm sq nut. Noted that
> > I put
> > half a cup of lysol bathroom spray in it. But haven't disconnected it
> > so I can dump the tank in the back yard. Yet.
> >
> And I still haven't dumped it. I bought an undersink Colligan sediment
> filter just because it looked like a higher quality unit than anything
> else I'd looked at, a bit less than $50 at tsc. Then I went to the local
> hdwe store and bought 2, 1/2" pipe to 1.4" hose barbs and 3/4" bushings
> to fit the filter ports. Should have bought brass, these were split
> molded, leaving a worn die fin at the junction of the die halves. Took 4
> layers a teflon tape to seal the threads and some permagoo on the barbs
> to seal them down to about a drop a minute or less leakage.
>
> But the screw on filter can might as well not have had an o-ring seal, it
> just poured out. Taking it apart again three or 4 times I finally grokked
> it had a pressure limit built in and that if it had city water pressure
> it would push the o-ring outward in its groove and seal. At 2 or 4 psi,
> taint gonna happen. Then I spotted a raised edge on the bottom of the
> cap, measured it and it would hit some carefully machined bumps located
> outside the o-ring groove, so as it was maybe 5 thou high, I reasoned it
> might get a better grip and seal on the o-ring if it was removed, so I
> filed it off until the file was touching the rest of the bottom face of
> the cap, then smoothed it up with a 600 grit diamond plate. Stop leak
> worked. I've got about a drop every 2 or so minutes at the output adapter
>
> I've unplugged the motor, and left lcnc thinking its running about 4k, so
> the pump is running, and all sorts of particulates can be seen in the
> filter but I'm far more interested in how clear the mix looks tomorrow.
>
> Right now it's cloudy and only the ghost of the pump can be seen thru the
> plastic tank. But it appears I may have a decent filter that doesn't seem
> to restrict the flow. And with 2 spare 5 micron filters I've got maybe
> $75 in it.
>
> Take care and stay well everybody.
>
> Cheers, Gene Heskett.
> --
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author, 1940)
> If we desire respect for the law, we must first make the law respectable.
> - Louis D. Brandeis
> Genes Web page <http://geneslinuxbox.net:6309/gene>
>
>
>
>
>
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>
--
Chris Albertson
Redondo Beach, California
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