Ammonia is new salt water mix

mrbranden

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Mar 20, 2003
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Massachusetts
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Hi. I'm having a very frustrating problem and I'm at a loss to explain what's wrong.

I'm trying to do a routine water change for my salt water tank. It's 150 gallons, so I'm trying to mix about 30 gallons of salt water. I do this every couple weeks.

I use a clean 32 gallon barrel, like the ones you'd take the garbage out in. I fill it with tap water (not RO/DI, unfortunately), dechlorinate it, get the temperature up, etc... Once that is done, I add the salt. The pump circulates it for a day or two, I add some buffer, circulate a bit more, check the pH and salinity, then I'm ready to go.

This is how I've done it for a year now.

A week ago, I was about to add some of this newly mixed water to my tank. For kicks, I decided to measure the ammonia in the new mix: 2.0 ppm! Hmm.. that can't be right. I use my other test kit.. same thing! I dig through my closet and pull out yet ANOTHER test it (yes, I'm serious): same thing! I waited another day or so... 2.5 ppm! (nitrate and nitrate were 0.0)

I check the tap water... ammonia is 0.0.

Hmm... must be a fluke. I dump out the 30 gallons of water. I go to the hardware store, buy another barrel, clean it out thoroughly, cleaned out my pump as best I could, then started the process again.

Within two hours of mixing it, the ammonia was over 1.0 ppm. After day two, it was at 2.0... now, at day 3, it's at 2.5. I tripled checked this with three test kits (two different brands). The nitrite in the barrel is 0.0 and the nitrate is 0.0.

(If it matters, temperature is 77.8 F, pH is 8.2, salinity is 1.023.)

What's scary is that this may have been happening all along and I just didn't know; I may have assumed the newly mixed water was fine, and when I was actually siphoning out 0.0 ammonia water I could have been replacing it with 2.5 ppm ammonia water.

My question:

What could be causing this water in the barrel to have such a huge ammonia spike so quickly???

In the meantime, I ended up going to freaking Petco and wasted money on 30 gallons of pre-mixed salt water just to get me by until this problem is solved. (Maybe I'll get a good answer soon so that I can return the water! :-))

Thanks everyone! :-)
 
Not that this should really matter but what kind of salt are you using?
 
Make up a small amount (like a gallon) & test it.
 
I was going to say make up a small bunch like a gallon in a glass container and test it.. If it comes out at 0 then you'll know its your container.

I'm finding it weird that its fine at your tap but not in your container so that leads me to believe your container is leaching something into the water. I can't believe its coming from the Instant Ocean as I have used that and Reef Crystals exclusively in my tank and have never had an issue.

While you've used two test kits I would error on the side of caution in instances like this and take a sample of my water to my LPS and have them double check for me.
 
I use a 33g Brute garbage can for my mixing. Hard to believe plastic would leech ammonia.
 
I do as well, but I doubt its coming from the salt mix.. and if its not coming from his tap it leaves the container..

Have you tried just putting plain water into your trash container no salt and seeing what happens?
 
I've actually not tried testing just plain fresh water in the barrel yet.

My hope was that someone would have said, "Oh, due to some <insert chemistry babble here>, ammonia readings can be messed up for a few days after you add salt" or something funky like that! Oh well, wishful thinking.

I am going to try what you guys suggest: create a small sample of water and see what it does, and also see what happens if I leave just fresh water in the big barrel.

Unfortunately, it'll have to wait until next week as I'm traveling out of state for a few days. Flight is in 8 hours and I've not yet packed! I'll have to use the pre-mixed stuff for now until I return.

I will post my results on this thread next week.

Thank you all again for your help!
 
Sorry, no magic answer on this one. It's very strange...
 
What did you clean the container with?
 
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