Instant Ocean Reef crystals - rust?

Anyone encounter this problem? I mix Reef Crystals as usual and after awhile the rust film appears on the walls of the brute container and pump.
 
It's not rust. I can't tell you exactly what it is, but it's not rust. I've been using Reef Crystals for years, and I filter it through a 10 micron filter sock before I use it. I get a LOT of that brown "gak" in the sock.
I honestly don't know if it's in any way harmful to your tank, I filter it out as I just don't want to add gak to my tank if I can help it.
 
Same here. Run it through a filter sock while mixing. Most common explanation is it's an anti-caking agent so moisture/humidity doesn't turn the salt into a rock.
 
hmmm... Sounds weird to me. Visually it looks normal. Never heard before I have to filter salt before use it.

So probably I'll switch to another salt.
What is the best salt on the market?
 
I have another unopened bag of Instant Ocean Reef Crystals. My thought is that opened bag for some reason if staying opened like week or two leads to this result... I'll try to mix tomorrow. And see what's happen. And then will try to mix a week later.
 
So I've open new bag of the salt and it looks good. No signs of rust film. So probably I had rust because I've mixed salt that was stored in container for about 1 month.
 
Maybe this is depends on the package? My salt is packed in plastic bag "not for resale" 4 in the box. So my only idea that the salt is opened and this cause some sort of reaction...
 
I get the same residue in my mixing barrel. I've used Reef crystals, IO and red sea pro. It doesnt seem to have a negative effect on my fish tank.

Found this on the H2Ocean D-D site: quoted from site

Brown deposit in H2Ocean Pro Plus Salt
Question:

I have recently bought a new tub of the ocean salt.

When mixed it is leaving a brown residuue on the bottom of the buckets.

I belong to a marine club and no of many other members who are experiancing the same problem.

Can you comfirm if the salt is contaminated of this is a harmfull substance.


Answer:

This brown residue is detailed on the instructions in the tub and is a residue of ferric oxide/hydroxide from the manufacturing process, (like Rowaphos). This product will bind to any phosphates and heavy metals in the water and allow them to precipitate out for removal via the skimmer.

The presence of the ferric deposits depends on the calcium source that we use to boost the calcium level. The best calcium source to use for incorporation and solubility into the final salt solution is the one which contains this ferric residue however as people tend not to like the brown deposits we do not generally use it. We have however had one batch in the UK, of which you must have received a drum, which did have such a residue as there was a supply issue on the normal calcium chemical.

This deposit is not harmful in any way and is actually beneficial to the final mix.

I hope this answers your query
http://www.theaquariumsolution.com/brown-deposit-h2ocean-pro-plus-salt

Also found this article
http://reefkeeping.com/issues/2005-07/rhf/

Quoted from article:
Solid Residues Remaining After Preparing Artificial Seawater

Most salt mixes leave behind a solid residue when dissolved, although the extent to which this occurs varies from brand to brand. I use Instant Ocean and rarely clean out the 44-gallon trashcan that I mix it in, so a significant residue builds up over time (Figure 1). In preparation for this article I removed some of this solid material, and found that it could be almost completely dissolved in hydrochloric acid with lots of bubbling. This demonstrates that these solids were probably calcium carbonate (CaCO3), perhaps also containing magnesium. Pure magnesium carbonate is undersaturated in seawater (which is detailed in later sections of this article) 1 and should dissolve in marine systems, so it isn't likely to be the precipitated material, although there may be significant magnesium in the calcium carbonate.
 
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I use 55gal barrels to mix my salt water. The bottom of the barrel is coated with that stuff. No harm done, as far as I know. It usually settles in 12hrs anyway.
 
ALthough I prefer other salts its not because of the coating that sometimes coats the containers. Ive used reef crystals before, as well as the Seachem product, Red Sea, and D-D h2o they all cause this to some level or another.

The main reason i like the other salts is because they more closely resemble the parameters i keep in my tank. RC tends to be lower in Mg and higher in Alk than others. Only reason I choose others. Here on RC in the water chemistry forum there is a long standing review of all parameters with most commercially available salts, check it out.
 
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