astroboy said:
True a high enough temp will kill anything, but, during the free swimming stage, the ick will not be able to stand a temp of 86 and the salt combined. The temp alone should be enough to kill it, the salt is an added precaution (necessary IMO).
Some sick fish will not be able to take a temperature of 86 degrees.
However, raising temps in conjunction with adding salt can be an effective way to eliminate the infestation of your fish.
And although I certainly recommend checking multiple sources for info, the linked page you provided clearly states it is the author's opinion. You have not really shown any evidence to back up your claim that table salt is appropriate for aquarium use.
I'd be more likely to trust the opinions and info from the University of Florida, which states:
"Although seawater is composed of many different salts, sodium chloride is the predominant one. Marine animals must be maintained in a saltwater solution that contains the micronutrients found in natural seawater. A number of products containing these nutrients are commercially available. Since the micronutrients present in sea salt are not critical for the survival of freshwater fish, either
noniodized table salt or rock salt (suitable for consumption by humans or livestock) may be used for salt "treatments" in these species"
Find it
here.
Or the University of Missouri, which states,
"The most common chemical added to transport water is salt (NaCl). Salt is used to relieve stress associated with maintaining a water balance in the fish. Freshwater fish have a blood salt concentration higher than the salts of the transport water. As a result, the fish are continually losing salts to the surrounding water. Concentrations of 5,000 ppm (0.5 percent) are commonly used. A 5,000 ppm concentration can be made by adding 19 grams (one tablespoon) of salt per gallon to water used during transport. Use
non-iodized salt that contain
no anti-caking compounds. Canning salt is a good example."
Find it
here.
Or the University of Hawaii, which suggests,
"...
un-iodized salt may be added to reduce stress."
Find it
here.
However, none of these opinions carry any proof either. What I'd really like to see are some research papers on the subject, so I could see the outcomes and the data for myself.