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Old 09-16-2006, 09:29 AM   #1
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Join Date: Feb 2006
Posts: 820
Ro/Di quality issues...and a few other questions..

Let me try to keep this short.

After my tank had been up for about 6 weeks I guess and testing @ zero for everything after a slight ammonia spike early on I decided to change some water.Mostly because I hadn't and wanted to see if RODI would help with my algea issues since I started with tap.

Twenty gallons later (90g tank) it went well.Two days after I tested at something just over .25 ammonia.Thats was worrisome and not at all what I expected.

So Off I go again to buy RO water (an hour round trip or so) and twenty more gallons later....the ammonia is there and just as high.

Off I go to get more to mix the next day and my bud suggests I salt it up and test it before adding it to the tank as though the new water may be the issue since I was at zero before the first change.I agree to do it,but I doubt the theory in all honesty.

Long story a bit longer the "new" rodi water tested at just under .5 ammonia after mixing.This is with two seperate (ap) test kits and a sample of known zero run at the same time to compare vials (not just to the card).

Cloramine will test as ammonia,or so I've read...so I declorinated a bucket and tested again....0.This was more then a little frustrating as you can imagine.

I called the store and let them know what I found,but of coarse he didn't see how that could possibly be...ect.

This whole thing may have cost me an angel fish (my third fish in total),but i'm not sure about that...it was either sick or stressed of both.....no way to know now I guess.But the first change came a day or two after adding him.

The questions:
Will cloramines test as ammonia?
Will declorinating the water take that ammonia test to 0?
[the above seem true per this experience]

Lastly..the fish store guy and ro/di unit engineer suggested that if that were the case the inverts would have died instantly,but my snails and crabs are/were doing fine.What do you thnk?

I should also mention that after declorinating the whole tank it too tested at 0.


50g tall fw planted at .6wpg
29g fw planted at 1.2 wpg
10g fw planted at 3 wpg cf
SCFatz is offline   Reply With Quote
Old 09-16-2006, 11:33 AM   #2
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this is strange. chloramine molecules are fairly large and surely be filtered out by the membrane and definitely by the di resin. this is the ro unit you posted on another post with the 2 di chambers right?

depending on the test, they will show up as ammonia.

how much water have you run through the system so far? i have heard that you need to flush the di resin for a while after setup to clear out impurities. not sure what truth there is to this,just something ive heard.

maybe try buying ro water from a different source and testing the salt mix.maybe a bad batch?have you checked your source water? if it is high, you could add carbon filters before the membrane in order to help. carbon will remove the chloramines but if you have a high ph tap water (8-9) then you will need to put in carbon filters before the membrane.very rare that your water ph is this high though.possibly well water.

sorry,kindda strayed a little.check source,after filter,and other source with salt mix and see what you come up with. im not a scientist,dont take this for fact.just what i have read.

dorian965 is offline   Reply With Quote
Old 09-17-2006, 07:47 AM   #3
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Join Date: Feb 2006
Posts: 820
The question is actually about water I was buying before I bought the rodi unit so its not really a problem anymore.

Just rying to make sure I had my head wrapped around the whole situation.Something about just didn't seem right so i figured i'd lay it out here and maybe learn somthing new.

50g tall fw planted at .6wpg
29g fw planted at 1.2 wpg
10g fw planted at 3 wpg cf
SCFatz is offline   Reply With Quote


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