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08/18/2012, 10:48 AM
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#1 |
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Registered Member.
Join Date: Oct 2004
Location: VIRGINIA
Posts: 196
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ro water has nitrates need advice
My Ro water after mixing with salt and left for 24 hours circulating has 5 to 10 ppm of nitrates and all filter media is new. I have been battling 80 ppm of nitrates in my tank for 3 months now. And suggestions or advice?
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08/18/2012, 10:53 AM
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#2 |
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Registered Member
Join Date: Nov 2003
Posts: 2,020
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Aside from the obvious (get another test kit to double-check), is the RO membrane itself new in your unit? Any chance you might try a new salt mix?
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08/18/2012, 11:05 AM
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#3 |
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Registered Member.
Join Date: Oct 2004
Location: VIRGINIA
Posts: 196
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Already using two different brand test kits and tested at lfs so its accurate. Yes New membrane. No fish in tank for 4 weeks. Sitting fallow because of ick. Just corals and cuc and lobster. Filter socks changed every three days. Gfo and carbon reactor. All clean. 180 gallons total water. Around 150 pounds live rock. Protein skimmer working good. One piece of shrimp every five days for lobster and starfish and anenome. Coral food once a week. I'm lost. 2 pouches of purigen in sump to help reduce.
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08/18/2012, 04:50 PM
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#4 |
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Registered Member
Join Date: May 2006
Location: WA
Posts: 2,592
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What's the nitrate reading of the plain RO water before mixing it with salt? If you haven't test it yet, give it a try to narrow down where it's coming from.
If your RO water is reading 5-10ppm (what test kits, by the way?), what does your tap water read before the RO? Is this just RO or RO/DI? If it's RO/DI, is the DI resin new also? |
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08/18/2012, 06:53 PM
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#5 |
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Reef Monster
Join Date: Sep 2011
Location: Long Island
Posts: 1,343
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Try changing the membrane
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08/18/2012, 07:55 PM
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#6 |
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Registered Member.
Join Date: Oct 2004
Location: VIRGINIA
Posts: 196
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It is Ro di membrane is changed. Api and sea chem test kits. I'll check if they do freshwater when I get home.
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08/18/2012, 08:02 PM
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#7 |
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Registered Member
Join Date: Feb 2010
Location: Baton Rouge, LA
Posts: 3,279
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80ppm nitrates then you have some other underlying problem. Most water company is regulated to <10ppm nitrates.
Might be built up nitrates over time. Perhaps multiple WC to get the levels down, then see if it goes up?
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08/19/2012, 01:09 AM
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#8 |
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Registered Member.
Join Date: Oct 2004
Location: VIRGINIA
Posts: 196
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When you say multiple how much and how often would you say i try? I agree on the underlying problem but I have no clue where else or what else to check.
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08/19/2012, 08:26 AM
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#9 |
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Registered Member
 Join Date: Dec 2008
Location: Garden Grove, Ca
Posts: 17,023
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Is this only an RO system or are you running DI also?
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08/19/2012, 08:53 AM
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#10 |
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RC Mod
 
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What is the TDS of the RO/DI system? Mesure the TDS before the RO/DI, after the RO, and after the DI. Grun, I saw DI somewhere above.
__________________
Jesse I'm not saying I'm Batman. I'm just saying nobody has ever seen me and Batman in a room together. |
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08/19/2012, 08:58 AM
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#11 |
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Registered Member
Join Date: Jan 2005
Location: Lynchburg, Va
Posts: 2,963
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measure the TDS coming out if its above 0 replace filters, if its only an RO unit try adding a DI unit. Ro doesn't pull everything out the DI is the polisher
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08/19/2012, 10:00 AM
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#12 |
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Registered Member.
Join Date: Oct 2004
Location: VIRGINIA
Posts: 196
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It is a di unit. Every filter and membrane was just replaced about three weeks ago. I have another Rodi unit that I haven't used with a dual Tds meter on it. Gonna try and set it up tonight to check tds. I don't have a seperate tds meter
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