Hyper-salinity water mixing questions

[eric b 125]

Does anyone see a problem with mixing a very high salinity solution so the salt fully dissolves and then the next day adding fresh water to make it the correct SG shortly before performing a water change?
I'd like to try doing this for a few service accounts so that I don't have to go to the place and start mixing a day ahead of time. I'd like to dissolve 15 cups (30 gallons worth) of salt in a 5 gallon bucket at my house and then dilute it with the remaining 25 gallons on site and let it mix while I scrape algae, clean power heads, etc. I'd have it mix for around an hour before doing the water change.
I personally don't see any problems doing it this way, but thought I would get your opinions on it before giving it a shot. Thanks in advance.

 

[bang guy]

Yes, I see a potential issue. Trying to mix the saltwater with a Ca level of 2400 and an Alkalinity of 18Meq/L is going to result in water with very low Mg, Ca, CO3, and Sr. Not something I would want to use.

 

[eric b 125]

Okay

 

[bang guy]

At minimum I would try it once at home before going to a client. I am, of course, just guessing what would happen. I have never tried it.

 

[eric b 125]

No, you make a good point. I don't understand the chemistry as well as I'd like to. It's something that I've been working on studying here and there over the past 6 months or so. I'm glad you caught it. I am not going to try it on my tanks so I'm not going to use this method on other ppls tanks.

 

[reefkprz]

I've tried it before and caused precipitation, (I didn't try 30 gallons if 5 gallons of water but I tried to double saturate it), I never tested the levels after the precipitation but the precipitation was most likely calcium dropping out of the water. I wouldnt reccomend it. you can mix up to like 1.031 or so and dilute down without a problem but that will only save you a couple gallons of lugging.