Re: [APD] Inline Carbon?

["S. Hieber" <shieber at yahoo_com>]

If you connect two centrifugal water pumps in series, you can somewhat less than double the output water pressure. If you connect them in parallel, the pressure will not be increased but the flow will be roughly doubled. Since canisters filters operate at only a a few psi, there is little advantage and littel problem to come from connecting  them in series. You would want to keep a close eye on the o-ring seal on the canister top on the second canister--a canister normally operates at a slightly negative pressure and the slightly positive pressure when its the 2nd canister in series) might exceed the o-ring's design limits -- but I doubt it.
 
You might do as well to simply run a second canister separately with carbon in it. Either way, carbon filtration by adsorbtion requires long exposure times, so low flow rates are ideal for that purpose. The removal of chlorine and some other chemicals is a catalytic reaction that operates more quickly and higher flow rates will still be effective.

 
Good luck, good fun,
sh
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----- Original Message ----
From: Rory O'Brien <rory_obrien at stonebow.otago.ac.nz>
To: aquatic plants digest <aquatic-plants at actwin_com>
Sent: Tuesday, April 25, 2006 10:56:44 PM
Subject: Re: [APD] Inline Carbon?


Thanks to all those who responded to my query, unfortunately, a brief look
about the local hardware store revealed nothing that looked like it could be
made to perform what I had in mind, at least not without a serious risk of
nasty leakage.

It occurs to me though that what I'm trying to construct, namely an inline
cavity with handy quick disconnect valves, is actually best described by,
well, a canister filter. It may be that my cheapest and, in all likelihood
most failsafe, option is to plumb in a second (pre-loved) canister filter to
the existing one and use that for housing some carbon instead. Quickly and
easily emptied of carbon and extra capacity could be used for more filter
floss.

So now my question to you is, can I connect two canister filters in series
like this (output from the main filter enters the input for the secondary
filter and then returns to tank)? Do I risk damaging my current filter (an
Eheim 2224, pump rated for 700l/h))? The secondary filter will likely be of
smaller capacity, possibly a Fluval 104 (480 l/h)as there is one currently
listed on our local (NZ) online auction site for not a whole lot of dollars.
Can this work?
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