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Mixing salt water

Was just wondering how everyone is mixing in there salt water. I once read that once the water was produce from an ro/di unit it should sit at least 24h to breathe new air into. Is this what everyone does or are you guys taking it straigh from the ro/di and adding salt then letting it sit for 24h. My thing is like a three day stage first day fill with water, 2nd day run with powerhead for 24h, and 3rd mix in the salt and let it sit for another 24h.
 

Phyl

Officer Emeritus
Officer Emeritus
Making sure the water is up to temp prior to measuring the SG is critical because the SG will read higher at lower temperatures, giving you a false high reading. This will cause your tank SG to decline over time.
 

Phyl

Officer Emeritus
Officer Emeritus
I've experienced vendor panic over this very issue! It was almost amusing.
 
Phyl,

That's not exactly true. You can consult a SG vs salinity chart and convert or have a properly calibrated ATC refractometer.
 
What I do is, fill the container with RO/DI, add couple of cups of salt at what ever temp the ro/di is, put in a powerhead and heater, wait till temp is up (next day) and adjust salinity. Would this process give different salinity reading compared to how you do it?
 
Another thing...... Aren't there refractometer/devices out there that compensate for temp when checking salinity.
 
Thats correct, my refractormeter compensates for temp. I used to make the mistake of checking the sg/salinity while the water was still cold and I developed a variation in the DT over a period of time. Once I was tempted to throw some salt into the DT, I now have a heater, pump and refractor meter so my waterchanges are on the money all the time now. ;D
 

Phyl

Officer Emeritus
Officer Emeritus
Calaxa, Yes, you can convert the numbers yourself if you know the chart... if you don't know to expect the difference you are going to go on the assumption that the SG is accurate when it may or may not be.

I saw this error first hand at the frag swap. While our refractometer is supposedly ATC, it (and the other one used by the vendor) did show a variation in relation to the temperature (1.03 instead of 1.025 that it was when it was up to temp). This caused one of our vendors major angst as they thought they needed to water down the water. Since the temp should be right when you move the water it doesn't hurt to double check your readings before and after the temp adjust to be sure yours is operating properly.

As this is personal experience it would be inappropriate to call it incorrect. ;D
 
When I first started the hobby I saw a lot of folks suggested going out and getting a rubbermaid brutus (32g I think) and using that to store water. It doesn't really matter what container you use, but having a dedicated container helps with estimating how much salt mix you need.

I still use a hydrometer (cheapo) so this is very important to me to keep mixing down.

I did read somewhere that the longer you keep the water the more PH and other trace elements that dissipate. Does PH decrease after days or weeks? I usually age my salt ~4 days+ before using it. Heck, it takes almost an entire day for the 30g's of water to reach temp in the garage..
 
All I can add is that I use a big metal paint mixer that attaches to my drill, has a thing like a squirrel cage fan on the end, and with my cordless drill that really gets the water going. You can mix the salt water up pretty quickly that way.
 
jimroth said:
All I can add is that I use a big metal paint mixer that attaches to my drill, has a thing like a squirrel cage fan on the end, and with my cordless drill that really gets the water going. You can mix the salt water up pretty quickly that way.

??? ??? ???
 
jimroth said:
All I can add is that I use a big metal paint mixer that attaches to my drill, has a thing like a squirrel cage fan on the end, and with my cordless drill that really gets the water going. You can mix the salt water up pretty quickly that way.

???
 

Phyl

Officer Emeritus
Officer Emeritus
I think they're having a hard time figuring out how a drill can mix saltwater with a paintmixer. Any pics of the setup? I'd guess that would clear it right up!
 

JohnS_323

Officer Emeritus
Officer Emeritus
Is there any concern about using a metal mixing blade? I've always heard that metal is a no-no with reef tanks but wasn't sure how much exposure would cause a problem.
 

redfishbluefish

Officer Emeritus
Officer Emeritus
Here are pictures of my paint mixers. I’m assuming Jim’s are similar. I wouldn’t be concerned about the use of metal since the exposure time would be minimal. In addition, the two on the right are stainless steel while the one on the left is ferrous metal covered with a Teflon type coating.

PaintMixers.jpg


My thoughts:

I prefer mixing salt by throwing a pump into the mixing tub and plugging it in and forgetting about it for a day a two. It takes a minute or two to set up and than you’re off doing something else. The paint mixer method, I would guess, would take five to ten minutes, at least.

I would only use the “paint mixer” option if there were an emergency and I had to make salt ASAP. The increased agitation assists in dissolving all the minerals. And believe me, especially the propeller one on the right, it immediately pulls you to the bottom of the tub and creates a tremendous vortex. I use it to mix five gallon buckets of paint…and does it mix. However, with salt, you still have some of those minerals that are tough to dissolve and I would prefer to just let it sit in a mixing tub with a powerhead and do its thing over time.

But than again, if it works for you, go for it.
 
What he said.

My paint mixer is similar but has a kind of cylyndrical fan on the end instead of the propeller. It's steel, the shaft is stainless, and I think the mixer is galvanized, in any even it hasn't rusted! It's only in there briefly, so metal contact does not concern me too much. I have a lot of time constraints, and this method works for me. I found with pumps there was always something left on the bottom of the can. I throw the salt into the preheated RO water, and usually have only 2 mixing sessions of 2 or 3 minutes, and bang I have 45G of very aireated saltwater!

Anybody have a good number on "pounds of salt mix per gallon @salinity X?" It would be a good table I guess. That;s where I end up fussing.
 
3 measured cups of io per 5 gallons puts me right at 1.025-1.026 .... but i suppose all brands would differ... io is all i've ever used...
 
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