submersible pump, 1-2 gph?

[astroboy]

Does anyone know of fairly reliable and inexpensive pump that moves 1-2 GPH?

 

Thanks,

 

Mark

[pizzaguy]

Huh. Is there such a thing? One to two gallons per hour

[Scott_LM]

Not submersible, but a dosing pump can give you around 1gph.

[flooddc]

This: http://autotopoff.com/Pumps/ft70.jpg

 

Adjustable from 0-66GPH

[astroboy]

This: http://autotopoff.com/Pumps/ft70.jpg

 

Adjustable from 0-66GPH

Thanks!

 

This should be just what I need. This is the reason I'm looking for a low-volume pump:

 

I went to a meeting of the Capital Cichlid Association and an angelfish breeder gave a talk on the genetics of angelfish and in passing talked a bit about how he'd developed a nitrate remover, based on some sewage treatments that have been around for quite a quite. His water is from a well, even after RO nitrates are still 10, which is too high for breeding, apparently, so he developed a version of the de-nitrator that was good for his 3000 gallon set up. Nitrates in are 10+ ppm, nitrates out are 0-2. None of the freshwater people were that interested but the few reef tankers there were talking with him for an hour afterwards. 

 

Basically, it's a remote deep sand bed, but instead of sand he uses rockwool (more surface area). Water is pumped at a slow rate in to the bottom of the container, overflow goes over the top (at least in a sump).  The trick, according to him, is that 1) the flow rate has to be such that the water in the RDSB takes 6-8 hours to turn over. If it's faster, the bacteria don't have to 'eat' the nitrates to get oxygen. The second point is that you need a carbon source (vodka, sugar water) for the chemical reactions to go forwards. For freshwater types, the amount of carbon is important since an excess is really bad news, for saltwater aquariums excess carbon gets turned in to bacteria which your protein skimmer removes so that shouldn't be such a worry. At least that's the theory. 

 

His point was that with a five gallon bucket RSBD, which will have about 4 gallons of useable nitrate to nitrogen gas conversion volume, you're producing about 12-14 gallons of zero nitrate water every day. For a 90 gallon tank that should result in near-zero nitrates.

 

He was aware of people actually using sand in RSBD, but he felt the water flow/turnover is likely so low that it doesn't make a difference, especially since all the RSBD designs I know of just have water flowing across the top of the sand. 

 

His name is Doug Gosnell. I'm getting links from him which I'll post. I'm going to set up a version of his denitrator and see how things pan out.

[AlanM]

Interesting stuff.