Funny you should ask that. They seem to be as lost as Brightwell when it comes to real chemisty
Calcium: target 422 mg/L, range 409 to 435 mg/L
Magnesium: target 1336 mg/L, range 1296 to 1376 mg/L
Strontium: target 8.4 mg/L, range 8.1 to 8.7 mg/L
Alkalinity and pH values vary widely over the Earth's oceans. salinityâ„¢ will be within the following ranges:
pH: 8.4 to 8.6
Alkalinity: 3.2 to 3.8 meq/
and
Using EPA Standard Method 6010 Salinity is guaranteed to mix at:
* 8.8 pH
* 9.8 dkH
* 1265 ppm Magnesium
* 437 ppm Calcium
* 383 ppm Potassium
But they are not saying at what Sg or Salinity.
Why is their Mg++ so far off ? If they claim +/- 3 % Ca++ and Mg++ why is the Mg so low in that data set@ 1265 but according to them they are +/- 3 % of 1336 mg/L /
Maybe because they have removed that EPA std from their website
salinityâ„¢ by aquavitro
salinityâ„¢ is a blend of salts specifically formulated for the reef aquarium that contains all ... Another first in the industry. *EPA Standard Method 6010 ...
www.aquavitro.com/Products/salinity.html - Cached
Then they tell to do this;
http://www.aquavitro.com/Products/salinity.html
To prepare small quantities, bring 35 grams of salinityâ„¢ up to a volume of 1 liter, or add 36.27 grams to 1 liter of water
They tell you the hydration rate is only 0.5 % Salinity at 35 PPT. That means 35 g in 965 ml of water will yield 34.8 ppt.
So, it seems their claim of this is correct, with the +/- 3 % range figured in
Calcium: target 422 mg/L, range 409 to 435 mg/L
Magnesium: target 1336 mg/L, range 1296 to 1376 mg/L
Strontium: target 8.4 mg/L, range 8.1 to 8.7 mg/L
Then they say;
Measure the salinity. We recommend a salinity of 35"°. If you are using a temperature compensated refractometer, this will be a density of 1.0260 kg/L
Last time I checked, yesterday, unless things have changed, the Density of Seawater at 25 C = 1.0233. Them, like Brightwell, STILL do not understand that Density is not the same thing as Sg
Then the next stupid thing they say is this
There are tables available that convert specific gravity to density, and density to salinity, but we find the following formula will yield a value for S (salinity) accurate to within 1%:
S = [0.3348 * T] + [1325 * H] - 1330.4525
where S is the salinity in parts per thousand; T is temperature in degrees centigrade (range of 13-30 °C); and H is the uncorrected hydrometer reading for a hydrometer calibrated at 15.56 °C (60 °F). If you don't mind an error on the order of ±3%, simply use the following table:
Show me one reefer, I'm sure there are a hand-full of them world wide
that uses a Lab hydrometer calibrated to 60 F. We almost all use hydrometers cal @ 75 F or 77F.
Then there is this
WOW, are those HM high compared to their Reef Salt. And this, the EPA std has been removed from the website also.