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Thread: Purigen? Should I consider a reactor? Reply to Thread
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  Topic Review (Newest First)
11-08-2012 07:09 PM
plamski Purigen reduce KNO3 and KH2PO4 produced from fish waste only. Purigen won't touch nutrient from EI dosing. That why it is great for High Tech planted tanks too.
11-08-2012 06:37 PM
discuspaul Back to your original question, Rainer - I've been using Purigen 24/7 in my planted discus tank for well over 2 years now, and wouldn't be without it for producing & maintaining crystal clear water.
I get Purigen in the 250 ml jar and bag it myself (double-bagging to ensure no particles escaping), and have re-charged each supply at least a dozen times (about every 3 weeks or so) before it begins to lose any effectiveness, and I need to replace it.
I run 4 bags at a time, one in each of my 2 filters, and the other 2 soaking in conditioned fresh water, after a re-charge, awaiting to replace the other 2 as they get dirty.
Here's my tank if you care to have a look:
11-08-2012 05:19 PM
Originally Posted by Monster Fish View Post
Grab a phosphate test kit and see how much you have in the tank. You might be bottoming out even though you're dosing EI.
The PO4 kit arrived today and both tests showed 10+ ppm.
10-22-2012 01:58 AM
Rainer I ran into algae issues first and decided to up the CO2 beyond the shrimp-safe level, since there weren't any left at that point. I'm planning to add more fish so the P level is going to jump anyway. In the meantime I'm boosting the KH2PO4 dose.

I've also cranked the flow from the spray bar so there are ripples and lots of flow, meaning I needed to add even more CO2. The fish are happy with the extra O2 but now I have a waterfall of floating plants.
10-11-2012 05:34 PM
Monster Fish Grab a phosphate test kit and see how much you have in the tank. You might be bottoming out even though you're dosing EI.
10-11-2012 03:34 PM
Rainer Not easily. I don't have a kit and the LFS doesn't test for it.

KH2PO4 dosing is the standard EI amount, as was the KNO3 which has proven to be massively overdosed. That doesn't completely rule out a P deficiency of course.

I'm seeing dust algae in several spots in the tank now, plus some BBA on the glass. Time to compensate for the CO2 being lost to the ripples from the new spray bar.
10-11-2012 03:10 PM
Monster Fish Can you test your phosphate?
10-11-2012 03:00 PM
Rainer This morning it was 40 ppm, so I skipped today's KNO3 dose. Added some liquid K to compensate.
10-11-2012 04:58 AM
Monster Fish What's your nitrates at?
10-11-2012 04:52 AM
Rainer I'm dosing standard KH2PO4 plus feeding the few current inhabitants, so I'm at a loss to explain it.

The marking on the needle valve was put there long before the nitrate problem was discovered. Is it possible the shrimp and fish were unusually susceptible to CO2 because of the nitrate stress?

If so, maybe the issue really is CO2 once the nitrate problem is gone.
10-11-2012 04:10 AM
Monster Fish Your CO2 seems fine then since you're below the threshold of your shrimps maximum tolerance. Your flow seems good as well, according to your posts in the other thread. So you can rule out the CO2 and the flow problems. You said the lower leaves darken and fall off. Maybe it's phosphate?
10-11-2012 03:56 AM
Rainer DC is light green. Solution hasn't been changed in awhile but reacts normally when brought into the air, etc. The needle valve is marked just before the point where shrimp start swimming around erratically, a symptom I consider a precursor of CO2 toxicity.

Several days ago I switched to a spray bar, so maybe I'm losing more CO2 to the atmosphere now. I think I'll whip up some more solution and see if the level can be boosted to compensate.
10-11-2012 03:33 AM
Monster Fish What's the color on the drop checker? Is the 4dKH solution still good? I'm stumped. I'm thinking it could an iron deficiency but you dose CSM+B.
10-11-2012 03:20 AM
Rainer It's still too early to tell but I'm not seeing remarkable changes. Others have raised the possibilities of CO2 deficiency or insufficient water movement. What do you think?
10-11-2012 03:14 AM
Monster Fish
Originally Posted by Rainer View Post
There's a thread about how recharging Purigen can be potentially toxic if you use CSM+B. You've probably seen it but I'd hate for something happen to those discus.
The cause of the problem was clarified. It was the use of certain brands of water conditioners that contained amine-based slime coatings during the regeneration process that caused the Purigen fouling. CSM+B is fine with Purigen.
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