Water changes and evaporation

[Zos4me]

So this is just a thought but when water evaporates your salt stays and salinity goes up. Your ato replenishes the lost water and salinity stabilizes. My 40 is goin through a 5 gallon bucket of freshwater a week. Wouldn't that be considered a 8% water change?
I could be way off but just looking for input
Thanks as always

 

[Bayareareefer18]

When water evaporates it is leaving behind more than just salt. Also all the nasties that you remove via a water change

 

[Zos4me]

Ok that makes sense

 

[Auquanut]

This is just my opinion, but when the water evaporates, all of the nastie's are left in the remaining water. So even though you are putting good water in, you're not really improving water quality.

Edit:
@Bayareareefer18 beat me to the punch.

 

[X-37B]

No its just evaporation.
A water change is with new salt water.

 

[Bayareareefer18]

Also WC is not only removing unwanted things but it is also is adding back good elements that rodi is not

 

[Zos4me]

Ok didn't realize that

 

[aqua_code]

WC replenishes nutrients that are used up by your system. Alk, Calcium, Magnesium, Iodine, etc.

Even with triton method and zero water changes - you have to supply these.

 

[beaslbob]

Ok didn't realize that

Remember that water changes will limit but not correct build ups or consumptions of anything. What is best is to balance out the system so that things don't change. Much.

For instance, if something is increasing at 1ppm/day and you change out 10% of the water every 10 days with 0ppm water, the tank will build up to 100ppm of that thing. The decrease by the water change eventually equals the increase between the changes. 1ppm/day*10 days is 10ppm increase. For a 10% water change to remove all that, the tank builds up to 100ppm then down to 90ppm then back up to 100ppm again.

my .02