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Old 11-04-2016, 12:08 PM   #173
Qian Hu

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Join Date: Jul 2009
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Quote:
Originally Posted by shermie View Post
Hi Qian Hu,

i was browsing through your hydra FAQ and noted that "Nitrates are then reduced by Hydroxyl Radicals to produce Nitrogen gas and escapes from the water". But since hydroxyl radicals have higher affinity for NH3/NH4+/NO2 as compared to NO3, how effective would a hydra stream be if my main goal is to reduce nitrates?

Eg my matured tanks have undetectable TAN and nitrites, but i have issues with keeping nitrates below 100ppm. my aim is to use a hydra stream for the return piping from water that has already passed through sump to tank, to reduce the nitrates to nitrogen. Technically since there is undetectable NH3/NH4+/NO2, the hydroxyl radicals would be more effective in reducing nitrates?

Do u have any data regarding how much nitrates would be reduced? Eg if my tank has 80-100ppm nitrates, and i'm doing WC every 2-3 days to keep it within that range, and i add in a hydra stream while maintaining my WC routine, would my nitrates have a noticeable reduction? i was unable to find any information on this online, and the nearest i could find was :
http://www.sgreefclub.com/forum/topi...-hydra-stream/
which states "Does not reduce nitrates if already present. Other nutrient export method required ".

Advise would be greatly appreciated.
Hi Shermie,

Thank you for your enquiry and congrats on having a very efficient filtration system that is able to handle NH3 and NO2! You are right in that Hydroxyl radicals produced by the Hydra Stream have higher affinity for NH3/NH4+/NO2 as compared to NO3.

Assuming you have a well stocked tank with regular feeding routine. Under such conditions, NH3/NH4+/NO2 is constantly being produced through waste, etc and as such the Hydroxyl radicals will target them first and lastly the NO3.

The Hydra Stream has been tested to be able to reduce Nitrate gradually overtime but it will not be able to provide quick results. We have data on the Nitrate reduction but Nitrate reduction is not the Hydra's main strength, it's main strength has been in reducing NH3/NH4+/NO2 and improving water clarity. Do drop me a PM with your email address and I'll email the tests results to you.

PS: I understand your current water change routine of once every 2-3 days is maintaining your NO3 levels at 80-100. Again I don't know your feeding routine or stocking levels, but a combined method of using Hydra (to control rate of NO3 increase) + current water change frequency + reducing the feeding for this period of NO3 reduction might be able to help.
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