Is inconsistent salt mix just normal now?

SpikesReef

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I'd like to preface this by stating I took a break from the hobby for about 5 years. In the past I used three different salt mixes and as long as I thoroughly mixed the dry ingredients I would get very close to the same parameters after mixing.

My go to in the past was HW Marinemix Reefer because I liked the parameters. I would always test before doing a water change and it was spot on.

Starting my current system I used the same HW reefer salt and no only have the parameters varied, they are well below what they should be according to the box and Ca and Mg are often below acceptable ranges.

After considerable differences in alk, ranging from 6.5 to 8.2, I decided to toss the HW Reefer salt in the dumpster and switched to Fauna Marine since it is also a pharmaceutical grade, fast-mixing salt that has parameters close to natural sea water.

For reference the HW Reefer salt also had these ranges across multiple batches (5+)
Ca- 320-420
Mg- 1000-1440

I bought two boxes since this seems to only be available from saltwater aquarium.com. I am upset to find that this salt also mixes well below the advertised levels.

Sad to see low levels again...

Advertised on box
Alk - 8.5
Ca - 440
Mg - 1300

After thoroughly mixing dry then making a 3.5g batch at 1.025

Alk - 7.0
Ca- 330
Mg- 1100

Before opening a new bag of salt I will thoroughly mix it within the bag for 20-30 minutes. It's a work out, and I'm in shape. Then I pour it into 4 5 gallon buckets, stirring around with a clean (used o ly for this purpose) paint mixer on a drill. Then I shuffle the salt between buckets like ten times, repeat the mixer and shuffle salts one more time before combining into a single bucket with a bag liner. This to me is compulsive and insane, but i figured if i can at least get consistent results on my salt mix, then buffering it would be easy. Easy meaning if im mixing the same volume of water and the need to buffer is the same, I can record those values and just add it in saving me a round of before and after testing.

My questions

Is this just the norm for salt parameters to be way different with every batch?

Am I too enticed by the pharma grade label and levels advertised on these obscure German salts? Would it be more advantageous to switch to a domestic product or something more readily available, with more turn over sales in the US?

I intend to buffer each Bach individually until these two bags are used up, although I'm not looking forward to it since I am only changing 3.5g a week lol.

Any insight is appreciated!

System 25 gallon lagoon, 20 lbs rock, sand, no skimmer, occasional mechanical filtration using socks or floss. Feeding mixed frozen and pellets on an auto feeder.
IMG_8711.jpeg
 
Anyone else using Fauna Marin salt without these issues?
When I used FM salt I never had these types of issues.

Maybe double check the salinity, low salinity will bring down all of the elements. The box does state 35PSU and that is 1.0262 rel. density…
Rel. density of 1.025 is 33.2 PSU…

On a side note I never had luck with Red Sea test kits for Ca and Mg. In general I had very little luck with any Mg test kits, some Ca test kits work better.
For Alk I prefer titration test kits vs. Hanna.

Good luck,
 
When I used FM salt I never had these types of issues.

Maybe double check the salinity, low salinity will bring down all of the elements. The box does state 35PSU and that is 1.0262 rel. density…
Rel. density of 1.025 is 33.2 PSU…

On a side note I never had luck with Red Sea test kits for Ca and Mg. In general I had very little luck with any Mg test kits, some Ca test kits work better.
For Alk I prefer titration test kits vs. Hanna.

Good luck,
Thanks for the insight. I didn't think that small variance between 1.025 and 1.026 could make a big difference so I'll add that to the things to check. I have salivary test kits coming to cross check.
 
 
From the article above:

(Bolded is the recipe)

3.65 grams of sodium chloride in 96.35 grams (mL) of purified fresh water. That amount roughly corresponds to ¼ cup (73.1 g) of Morton's Iodized Salt dissolved into 2 liters (2000 g) of water (giving very slightly more than 2 L of total volume).

For a rougher measurement in the absence of an accurate water volume or weight measurement:

1. Measure ¼ cup of Morton's Iodized Salt (about 73.1 g)
2. Add 1 teaspoon of salt (making about 79.3 g total salt)
3. Measure the full volume of a plastic 2-L Coke or Diet Coke bottle filled with purified fresh water (about 2104.4 g)
4. Dissolve the total salt (79.3 g) in the total water volume (2104 g) to make an approximately 3.65 weight percent solution of NaCl. The volume of this solution will be slightly larger than the Coke bottle, so dissolve it in another container.
 
That is frustrating. I have had good results with Tropic Marin in recent years, though there was an issue during the pandemic I believe. I do correct the Alkalinity. I am pretty happy with it. I have used HW Reefer in the past but I like TM better.

I personally don’t worry too much about matching Mg and Ca levels. As long as they are close. I figure my test accuracy results in some variance.
 
People test their fresh saltwater batches? :rolling-on-the-floor-laughing: I use reef crystals and what ever it mixes up too it works lol.
 

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