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Old 01-09-2004, 08:45 PM   #1
hypsophrys
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Hey folks,

I'm considering modifying my Whisper Micro (70gph) to be a reactor and biological filter.

If you aren't familiar with these, they are internal, with a small pump at the bottom, and a long plastic basket/chamber above. The basket is meant to hold Whisper "Bio Bags". Water flows up behind the bag, then through it and out an overflow at the top front of the basket.

I want to take out the bag, and place a CO2 airstone in the bottom of the basket. I'll put a small layer of poly on top of that, then fill the chamber with BioMax media.

Comments? Would this setup (namely, the poly) place undue back-pressure on the pump?

I'll post pics of the mod if I decide to go forward.

Ian
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Old 01-09-2004, 08:47 PM   #2
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BTW - I wanted to simply release CO2 under the inlet to the pump, but the inlet design makes that rather difficult...
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Old 01-09-2004, 09:26 PM   #3
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I've got one of those Whisper Micros. I would think the CO2 would simply bubble up right with the water flow and not have enough time to diffuse into the water. I think you'd have a better shot at trying to scoop the CO2 gas into that pump inlet to let the impeller break up the CO2 bubbles.
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Old 01-09-2004, 09:53 PM   #4
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Ok, I was afraid of that... Might as well do it "right." :-)

Here's what I did:
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Old 01-09-2004, 09:54 PM   #5
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CO2 aside, what do you think of poly and BioMax instead of the bags? I hate replacing them, especially when I don't particularly care about carbon.

Ian
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Old 01-09-2004, 09:55 PM   #6
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Last thing, do I need to worry about "venturi effect"?
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Old 01-09-2004, 10:00 PM   #7
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Poly and biomax might work quite well. The Whisper Micro cartridges are dirt cheap, though.
What venturi effect would you worry about? The pump drawing a vacuum on the Yeast/Sugar mix?
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Old 01-09-2004, 10:06 PM   #8
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Quote:
Originally Posted by GulfCoastAquarian
The pump drawing a vacuum on the Yeast/Sugar mix?
Yep, there was a horror story thread on this, somewhere. It seems silly to me, but it doesn't hurt to ask...

Ian
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Old 01-09-2004, 10:16 PM   #9
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No, it happened to me. But it was with a much bigger filter. Someone was using an Azoo mini or an ACmini and ran the CO2 into it and had no problems. I also might have had the yeast/sugar mixture a little too close to full. As long as you keep the bottle 2/3rds to 3/4ths full, it should be fine.
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Old 01-09-2004, 10:21 PM   #10
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Quote:
Originally Posted by GulfCoastAquarian
No, it happened to me.
Not so silly, eh? ops:

Anyway, thanks for all the input, Sam; very helpful.

Ian
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