gosh, two posts for the price of one--lol. I am being lazy. So, if you get confused about which thread you are in....all my fault.
my definition of a good water conditioner is how many gallons of water does it treat for a buck. All i have ever been after is chlorine and chloramine elimination. Along with the heavy metal detox. After that you seem to be paying for worthless marketing hype.
Fresh water will restore all the electolytes that need restoring. It will provide all the trace minerals that may have been depleted. It doesn't do anything for the aloe vera. But wait, i forgot, fish don't immerse themselves in aloe vera anyway. A healthy fish should not need anything to "restore" their slime coat. Water changes do not wash away slime coats.
And, the bacteria oriented water conditioners that suggest you need to use them at every water change--no. the colony of denitrifying bacteria in your tank does not get damaged during water changes.
DeChlor and Tap Water Conditioner are two products that bring the cost per gallon of water conditioning way down. There are others--those are just two I have used for many years.
I know a lot of people that swear by amquel. That way they are protected from the ammonia released as chloramines have the bonds broken. They are more comfortable not exposing their fish to the brief ammonia spike. I do not pay attention to that . Have never experienced any problems. And, the bio-filter will take care of the free ammonia that results from the chloramine elimination very quickly.