Seachem Equilibrium Analysis, Not Tolstoy, but…
Looked at Seachem Equilibrium, I have used this in the past; I guess I figured it was a lot of money for water, I wish I had analyzed it. Oh well…
Based on Seachem’s information Equilibrium seems to be primarily Potassium sulfate, gypsum, Epsom salt, with a little Iron(II) sulfate, probably ferrous sulfate heptahydrate and a tiny amount of Manganese(II) sulfate, probably manganese sulfate tetrahydrate.
The Potassium sulfate K₂SO₄ is particularly interesting since K⁺ does not play a role in general hardness, in fact many water softeners trade two K⁺ ions for each GH ion, usually Ca²⁺ or Mg²⁺. There seems a long time ago to have been a misunderstanding about water hardness in the aquarium community. Anyway K⁺ makes up 19.5%, 195000-ppm of Seachem’s Equilibrium.
Gypsum, Calcium sulfate dihydrate, CaSO₄⦁2H₂O, this is likely the white stuff folks mention seeing, as gypsum is essentially insoluble, it works in our systems, since no salt is totally insoluble, so at 20℃ about 2.4-grams per liter. The Calcium ion, Ca²⁺ makes up 8.06%, 80,600-ppm and definitely adds to the general hardness.
Epsom salt, Magnesium sulfate heptahydrate, MgSO₄⦁7H₂O. The Magnesium ion, Mg²⁺ makes up 2.41%, 24,100-ppm. This is in the typical proportions we see in general hardness.
Ferrous sulfate heptahydrate, FeSO₄⦁7H₂O. Iron(II), Fe²⁺makes up 0.11%, 1,100-ppm.
Manganese sulfate tetrahydrate, MnSO₄⦁4H₂O. Manganese(II), Mn²⁺ makes up 0.06%, 600-ppm.
The big winner though seems to be sulfate, SO₄²⁻ coming in at 53.14%, 531,400-ppm. While a little sulfate is necessary, this seems excessive
Honestly I think Calcium chloride and Epsom salt are sufficient, the K⁺, Fe²⁺ and Mn²⁺ you will dose anyway and K⁺ does not add to hardness. The Epsom salt provides plenty of sulfate and sulfate does not add to water hardness.
Since I have not tested Seachem Equilibrium myself, I base my calculation on information provided by Seachem. As to the specific hydrates, I guessed, based on availability and cost.
Total sulfate levels could be somewhat higher depending on hydrates used. Unless Seachem chooses to change its policy and be forthcoming about its ingredients. This is the best I can do without actually buying a bottle.
If your Guru tells you otherwise and you are true believer that is okay I will not argue the point.
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I pretty much limit what I say to things that anyone can easily verify from recognized references or by direct observation. If it is my opinion I say so.
Last edited by JoeRoun; 12-25-2014 at 04:54 AM.