Re: [APML] Creeping Film

["bert katzung" <katzung1@home.com>]

Hi Philip:
I thought there were two sorts of aquarium pumps: one for pumping water
through the filter and the other kind for pumping air through the aerator
thing. Not a high pressure thing, but enough to move a bit of volume of air.
Any tropical fish enthusiasts out there? (Haven't been near an aquarium
store in 40 years!)
Bert

Bert Katzung
katzung1@home.com
www.astronomy-images.com

----- Original Message -----
From: "Philip Perkins" <philip@astrocruise.com>
To: <astro-photo@seds.org>
Sent: Monday, 06 August, 2001 1:17 PM
Subject: RE: [APML] Creeping Film


<snip>
>
> Well, I've always been happy with my N2 system, though I agree that a dry
> air system would be cheaper and a bit easier to transport.  Though once
> purchased the cost of operating an N2 system is very low.  My cylinders (I
> have two) need recharging about every year to 18 months and the recharge
> cost is certainly there but low enough that it doesn't register.  This
> occasional cost is offset against the minor inconvenience of having to
> constantly recharge the desiccant in the case of the dry system.  But I
> wonder about the aquarium pump?  I purchased an exactly similar thing just
> recently to provide additional water cooling for my ST-8E and while the
> water pressure is quite satisfactory the air pressure it generates seems
> very feeble to me.  It has a tiny impeller that is designed for moving
> water...
>
> --Philip
>
> Philip Perkins - philip@astrocruise.com
> Wiltshire UK & Luberon France
> Astrocruise - http://www.astrocruise.com



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