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I ordered 33 Oz carton of this salt but what I got was two cartons of 16 Oz each. I will never buy any item from Sai Aquarium.. Very disappointed that after waiting for 5days I had to return the product and order new one...
Bought to put trace minerals into water and fight any fungus. The dosage recommended is very small, and is enough to put some trace minerals into the water. To fight fungus, the concentration needs to be much much higher, which fish can only tolerate for short periods, so there's probably not much benefit increasing the recommended dose much (up to double dose is OK, from my use of it). The reason why higher dose is not recommended, IMO, is because it's not "meant" for freshwater fish like Bettas. Also, scaleless fish like Catfish react worse to it as it upsets their balance (I've noticed this recently in my Loaches). So a small amount, in accordance with recommended dose (or double at max) is fine.
The problem here is the price and the marketing. This is just salt. It is probably sea salt, i.e. sodium chloride, as rock salt is more expensive. Rock salt is basically much purer sodium chloride (99% vs 85% in sea salt). So, you can just buy ordinary sea salt which must be additive-free. I've just bought a 1kg one on Amazon for £2.50 which should last me at least 1 year, if not several years. There is no such thing as "Aquarium Salt" - it's like saying "Dinner Salt" or "Lunch Salt". Just ensure it's Sea Salt or Rock Salt and you're fine.
This is why I've given 3 stars. Because I'm tired of these Aquarium manufacturers ripping off people by taking advantage of people's ignorance. Before I started doing all this research - and I'd love to not have any reason to research, but the price tags on aquarium products makes it necessary for me to do - I was ignorant, completely ignorant about fishkeeping, and I still am to a large degree. I can save you some money on this Salt issue, though, so hope it helps.
I’ve been using this salt 3 weeks ago, I added it every time I do water change. I have healthy fish prior to using it but 2 fish died recently and they’re not old age. They just stopped eating and died in a few days. Not blaming the salt, they might have been sick but what I’m saying is if the salt prevent illnesses then why are the fish getting sick? I haven’t noticed anything different since I used it so I’m thinking maybe it doesn’t work?