Well I don't think I can debate much further because that is about as far as my knowlege goes. I would only like to point some things out.

Yellow Prussiate of Soda is very much still used as an anti-caking agent in table salts. I think we can all agree that a salt with that in it should be avoided at all costs ;)

Salt dips and baths are only usefull if you know what you are doing. I don't recomend that anyone tries it without help and guidance from some one knowlegable. This treatment is mainly used for treating external parasites on large, salt tolerant fish such as goldfish. If you get the wrong salt, the wrong salinity, the wrong length of time, fail to pull them out if they don't take it well, or dip a weak, small, or salt-intolerant fish, things can go very wrong.

Wierd little thing I just noticed. Woeisme, you say an anti-caking agent commonly used is Sodium Silicoaluminate, another form of zeolite? I think it is a bit humorous that if you add salt to water that contains zeolite, the zeolite will release all of the ammonia it has soaked up prebiously. How small the aquatic chemistry world is :)

That quote is by Paul, screen name Toothless, and I got his permission to copy and paste his thoughts onto my topic. If you have questions I don't think he would mind you politely asking him, but do not badger or argue with him. He's very busy and I'm sure he prefers to be left out of it.

I'd love to hear others opinions on the subject. Keep it polite please, no verbal attacks.

I wouldn't badger anyone. I didn't intend to. I just think this is an interesting topic because of its controversy. I am no authority on this subject by any means. I am just sharing things that I question about this subject. I meant no personal attack or disrespect to anyone, just like to learn from people. I also have spoke with a chemist for a pharmaceutical company and aquarium hobbyist. He was my neighbor as a kid and had awesome aquariums. He instructed me to use tablesalt a long time ago. I did question him again about it a couple years ago I was assured that any anti caking agents used in salts are so minimal that even if they are toxic would not be a factor.
Littlehippygirl, you bring up a good point about salt removing ammonia in zeolite. If you have an aquarium that already has salt in it then add zeolite, the zeolite will still absorb ammonia. If you have zeolite in your filter for the purpose of absorbing ammonia, then add salt and raise salinity the ammonia will release from the zeolite. Salt is also used to make a brine that will regenerate zeolite so it can be reused. Link below for zeolite. I was only using this comparison because zeolite is used in aquariums, I didn't mean it was an added benefit, sorry for any confusion to anyone.
I apologize to anyone that took my critique as anything but good old discussion. I have no intention of making a typical message board type feud. The thing I do love about different veiws is that it inspires research, nothing wrong with learning something new.

Here is a link that might be useful: zeolite

"If you have an aquarium that already has salt in it then add zeolite, the zeolite will still absorb ammonia"

That is something I did not know before :) I've never used zeiolite in aquariums (for other readers, yes, a cycled tank is a much better option unless there are special circumstances).

Sorry, been real busy. I forgot to add Activated Carbon would most likely remove the Y.P.S. before it had a chance to "become" free cyanide. Acording to the link below and other sources cyanide isn't toxic until it gets to the 2ppm level. I guess that's why I've been told that the level in table salt isn't a concern. That and the exposure to sunlight. I wish others had input to share, but I guess it is a boring topic to most. Little stupid crap like this I find facinating though.

I wish I had input to share, too. ^^; I've never added any kind of salt to a fish tank 'cause I've never needed to. I do find this thread interesting to read though, in case I should ever need to use salt.

not boring at all, woe, just out of my league! :)

I am just having a look at this old thread and will comment only on the zeolite. The natural zeolite is of the clinoptilolite mineral referred to here I would suspect. It is formed from volcanic ash that falls into a saline lake.
It has an order of preference for cations. At the bottom is sodium then ammonia then things like potassium, magnesium, calcium and at the end the high preference are heavy metals such as lead, cadmium etc. What this means is that clinoptilolite will more likely hold and not exchange out those higher in its order of preference. So it will not exchange lead for sodium or ammonia for sodium.
We mine and process clinoptilolite natural zeolite and sell large quantities into the swimming pool market to replace the filter media in sand or diatomaceous earth filters. In salt and chlorinated swimming pools it works the same.
For aquariums the clinoptilolite, natural zeolite is very suitable but I would still blend in activated carbon. The zeolite is good for molecules and individual atoms of up to 120 in molecular weight and then activated carbon is better for anything larger. Organic molecules you also wish to remove may be quite large in size. Zeolite will be great on removing ammonia and still allow table salt to be used.
As stated above, it is true a brine of very concentrated table salt will exchange out other cations such as ammonia as it will simply overwhelm them. You could also just buy more zeolite!
Natural zeolites vary in hardness and any preloading with cations. Zeolite from young deposits of only a few million years of age will be soft and chalky and likely still be loaded with cations for example of potassium and calcium. Older deposits hundreds of millions years in age are harder and less loaded with cations. The latter is more suited to aquariums.
If in doubt when you buy some, sit the zeolite in a bucket of water of a heavy mixture of table salt for a few hours to a day before loading your filter (with some activated charcoal).