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Old 08-10-2007, 08:58 PM   #71
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It is not a coil denitrator.
Oh, I meant Marshy's unit.
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Old 08-10-2007, 09:30 PM   #72
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Originally Posted by silane View Post
When the ORP value get lowered, that means the denitrator is working, right? Where do you insert the ORP probe?
For carbon based denitrator, I get the best result with ORP reading between -200 to -250mV.
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Old 08-10-2007, 09:32 PM   #73
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How much would a NR5000 cost? It is cheaper to DIY?
NR5000 is around the region of 2k. DIY is definely much much cheaper.
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Old 08-10-2007, 09:37 PM   #74
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Originally Posted by Spakase View Post
Oh, I meant Marshy's unit.
I suggested to him using a long length of coil before going into his NR1000 to improve the performance. It is making use of best of both world concept, coil denitrator n commercial carbon base denitrator. As for actual result, the best person is asking Marshy directly although I practised that before but not now. Reason .... making space for my 12" fan!
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Old 08-10-2007, 10:25 PM   #75
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Interesting discussion on Denitrator and would like to share my views on using coil and carbon fed denitrator NR1000 before adopting the use of sulphur-based denitrator.

My thought is to explore the explore the the Schuran Nitrate Filter is one-third of the cost of the NR5000.

The only difference is that it used sulphur beads as the media to encourage the growth of the bacteria which oxidise sulphur to produce sulphate and reduce nitrate to nitrogen gas in the process.

I have been using this in a freshwater environment previously before migrating to a marine application for about 2 years now despite the fact that
it is best suited to freshwater hobbyists than marine reefers.

So far it has been holding well with NO3 undectable under low resolution nitrate test kit.
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Old 09-10-2007, 03:05 AM   #76
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thanks for sharing...
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Old 09-10-2007, 04:47 AM   #77
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Originally Posted by Sunburst View Post
Interesting discussion on Denitrator and would like to share my views on using coil and carbon fed denitrator NR1000 before adopting the use of sulphur-based denitrator.

My thought is to explore the explore the the Schuran Nitrate Filter is one-third of the cost of the NR5000.

The only difference is that it used sulphur beads as the media to encourage the growth of the bacteria which oxidise sulphur to produce sulphate and reduce nitrate to nitrogen gas in the process.

I have been using this in a freshwater environment previously before migrating to a marine application for about 2 years now despite the fact that
it is best suited to freshwater hobbyists than marine reefers.

So far it has been holding well with NO3 undectable under low resolution nitrate test kit.
Schuan Nitrate Filter is small as compare to NR5000 which is quite huge. It should be compare to NR1000.

IMO, sulphur based is more suitable for marine reefer than freshwater hobbyist. . The reaction series (4 NO3 + 3 S = 2 N2 + 3 SO4 or 2 H2O + 5 S + 6 NO3- à 3 N2 + 5 SO4-- + 4 H+) involved is acidic (sulpuric acid)and thus it must be tied up with very good buffering. As such most reefer will combine the sulphur based denitrator with a calcium reactor.

Using sulphur based denitrator will result in excess sulfate which is not common for freshwater but not so in seawater.

Sulphur-based denitrification in freshwater is based upon autotrophic denitrification by sulphur-oxidizing bacteria, such as Thiobacillus denitrificans and Thiomicrospira denitrificans.
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Old 09-10-2007, 04:52 AM   #78
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One big advantage of sulphur based denitrator over carbon based denitrator is : it doesn't produce a large amount of bacterial slime!
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Old 09-10-2007, 11:30 AM   #79
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One big advantage of sulphur based denitrator over carbon based denitrator is : it doesn't produce a large amount of bacterial slime!
bro.. u got the nr5000 from HK? cos i think u told me if get from HK.. the price will be lower rite?
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Old 09-10-2007, 01:41 PM   #80
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bro.. u got the nr5000 from HK? cos i think u told me if get from HK.. the price will be lower rite?
No. HK is much cheaper but I got it in SG with a special price during aquarama.
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