What is the specific gravity of Tech M?

[Inexplicable]

I'm dosing to get rid of a small patch of bryopsis in one of my 10 gallon tanks, so specific gravity swings concern me. Does anyone know the specific gravity of Kent Tech M such that I can calculate how much water to remove per added amount of Tech M to maintain 1.0264 specific gravity? Thanks.

[HighlandReefer]

I don't believe the Tech M label discloses what they have in this product, perhaps mag chloride, perhaps mag sulfate or perhaps a combination of the two. ;)



A quote from Boomer:

"Re: Does Mg affect Salinity?

If the Mg++ is 1300 ppm and one raised it to 1800 ppm

1800 - 1300 = 500 ppm rise

When you raise the Mg+= you are not just raising the Mg++but alos the Cl- as Mg++ comes as MgCl2 or MgSO4

If he was using jsut MgCl2

For each 1 ppm mg ++ you get 3.9 ppm Cl-
500 ppm x 3.9 = 1950 ppm salinity or 1.9 ppt



If he was using just MgSO2

For each 1 ppm Mg++ you get 4.9 ppm SO4
500 x 4.9 = 2450 ppm Salinity or 2.4 ppt

That is allot. 35 ppt to 36.9 or 37.4 ppt


His 1.025-1.026 to 1.028-1.029

1.025 -1.026 = 33.2 ppt - 34.5 ppt and 1.028 - 1.029 = 37 ppt - 38.5 ppt

You take the value I calculated above and they about fit right into what he got. Just go with the 1.025 to 1.028 rise he got = 33 ppt to 37 ppt = 4 ppt

33.2 ppt + 1.9 = 35.1 ppt with MgCl2

33 ppt + 2.9 = 35.9 ppt with MgSO4"

[Inexplicable]

Ok thanks, that was very helpful. I'll check the refractive indices before and after each dose to make sure I'm on track, but that gives me a good guideline to go off of.

[HighlandReefer]

You're welcome. ;)