Recommended small pump for needlewheel mod?

**shoggoth43** · 08-06-2010, 07:51 PM

I know Tom likes the Rio 1000 powerheads but they aren't easy to find around here. All the Rio pumps I can find now have the new type of impeller so I suspect the "old" style has been replaced by the "plus" line which has little flapping vanes on the impeller making a mod considerably more difficult.

I've considered a SEIO prop pump and using the not-quite-a-venturi on that but my experiments with the smallest model lead me to believe that will be obnoxiously loud and the CO2 not particularly finely chopped.

Can anyone suggest a decently sized unit for a 5 foot tank? Or maybe two smaller ones and I'll just do two halves of the tank with lower bubble counts for each unit? Noise is a high concern for me on this one as the tank is in the living room.

-
S

**pat w** · 08-06-2010, 11:53 PM

I'm going to buy a Rio 800 RVT toward the end of the month to replace the 180 currently feeding my CO2 reactor. I'm hoping the irregular surfaces of the new impeller design will add a little more chopping action without a mod. My tank is in my living room as well, so noise level will count. I'll let you know how it turns out.

Pat

**jeff5614** · 08-07-2010, 01:31 AM

I bought a Rio+ 400 from PremiumAquatics.com a couple of weeks ago and it had the old style impeller. Doing the mod with a pair of wire cutters took probably all of two minutes.

**Tom Barr** · 08-07-2010, 10:18 PM

The Maxi Jet powerheads are good, they also sell prefilters and other mods for them.
Easy to mod those impellers, I like the boxy look of the Rio's though.

Regards,
Tom Barr

**csmith** · 08-07-2010, 11:45 PM

As Tom said, Maxi-Jets are good powerheads for this. I've used one for quite a few months now and it's incredibly quiet. If you use a sewing needle for your holes you can get 6 holes easily into each impeller of a 400, so there's no telling how high you can go with the larger ones. My tank is maybe 10 feet from my bed, and it works well as far as noise goes.

**hbosman** · 08-09-2010, 09:13 PM

I use the model 180 ViaAqua for a 46 gallon bowfront. The impeller is made of soft plastic so I could snip each blade twice, dividing it into three. Since it is small, it is well hidden in the lower left back corner blowing the mist along the back glass below plant level. The mist does rise higher before it reaches the right back corner and circulates slowly along the front glass. I can hear the CO2 bubbles hitting the impeller, it kind sounds like one of those water features where water bubbles over rocks. I'm not crazy about sound, kind of gotten used to it though. The misting or intense pearling of the plants isn't exactly appealing either but the impeller mod is the lowest maintenance, cheapest and most efficient method I've used so far so, I'll stick with it. I've used inline PVC regulators and inline ceramic diffusers and while they worked well, I wasn't to happy about stuff attached to the output of my canister filter. There was potential for leaks even though it never happened to me and I didn't care for it interferring with filter flow. The only thing I have inline is the hydor heater.

Anyway, for the price, I think it's worth a try. If you don't like it, you wouldn't have spent much money or time. It's easy to build and remove. A spare powerhead is always handy to have.

http://www.fosterandsmithaquatics.co...fm?pcatid=8164

**Tom Barr** · 08-10-2010, 05:26 PM

FYI, every method of CO2 diffusion will have some trade offs.

Regards,
Tom Barr

**hbosman** · 08-10-2010, 07:54 PM

Tom, have you had any exposure to the Cerge Reactor? Any opinions?

http://www.plantedtank.net/forums/di...reactor-5.html

**Left C** · 08-12-2010, 04:28 AM

Originally Posted by shoggoth43

... I've considered a SEIO prop pump and using the not-quite-a-venturi on that but my experiments with the smallest model lead me to believe that will be obnoxiously loud and the CO2 not particularly finely chopped.

Can anyone suggest a decently sized unit for a 5 foot tank? Or maybe two smaller ones and I'll just do two halves of the tank with lower bubble counts for each unit? Noise is a high concern for me on this one as the tank is in the living room.

-
S

Hi S

I have three small Iwaki external pumps that I'm not using that might work. Two are MD-10's (186 US gph) and one is a MD-6 (138 US gph). You could either modify the pump blades or do a mesh mod on them. They are made for 1/2" tubing. They do not have NPT threads. The two MD-10's may work fine in for your 5 ft. PM me if interested.
http://www.iwakiamerica.com/Literature/MD_WMD/MD610.pdf
http://www.iwakiamerica.com/products/wmd.htm

**pat w** · 08-23-2010, 02:20 AM

Finally got the Rio 800 RVT with the new impeller design. Noticeably smaller bubbles than the unmodified Rio 180 that was feeding the external reactor. You can barely see them from a distance. Small enough that no one really cares that I retired the external reactor. Going pure mist now. Very quiet. Just the sound of the bubbles being smashed.

Just FYI.
Pat