Does salt go bad/expire?

[fronty]

I purchased around eight 5 gallon buckets of Reef Crystals. I'm guessing the tubs aren't air tight. The salt may be clumpy. I wouldn't think it would actually go bad, however. Unless, the salt may have absorbed external pollutants. Do you know if the manufacturer puts an expiration or manufacturer date on them. They've been in my garage for probably the last eight years.

 

[griss]

I would mix up a batch and test parameters, specifically Alk, pH, Ca, and Mg. Possibly also test Ammonia, Nitrite and Nitrate. If those are all good, I’d think you’d be good to use it.

Here’s another perspective

FAQ #41: Does aquarium salt mix ever go bad?

Today on BRStv, we have another episode of BRS 52 FAQ where we answer all of your frequently asked reefing questions from our popular 52 Weeks of Reefing series. Today we are answering drum4life’s question: "Do salt mixes have a shelf or expiration date? For example, buying salt and putting it in

www.bulkreefsupply.com

 

[wvned]

it’s all minerals but the alk and calcium can combine to form calcium carbonate.
You can tell that because it won’t dissolve when you mix it up in water