Thank you that was exactly the info I was looking for. I will certainly measure the Mg level when the tank reaches 1.026, but now I know that I can expect around 1235 using that formula. Sounds like DKH would raise about .5 which is also fine. When I get to 1.026 I will remeasure and post the result for others future reference.
I think you are missing the point. No - they will not . If the salinity increases by x percent - the others will increase the same percent. With 1 salt vs another, the starting point might be different, but the change will be the same. The easiest way - is to just measure the Mg, etc directly, when increasing the salinity. (the OP was going to increase the salinity just by letting it evaporate) - thus the percentage is important not which salt he was using
That 31.9 would be the concertion of your salinity in sg (1.024 sg) to ppt (31.9 ppt). same with the other numbers. I prefer to use ppt unit to salinity.
Sorry but this is a confusing mess. You cannot just 'take off' the 1.0 part. Maybe its just the wording. The BEST thing to do is to just measure the Mg at whatever salinity you end up with. Again I'm not trying to make this more confusing that you've made it - but to me this makes no sense: "So 26/24 (31.9/34.5 ppt) = 1.082." - I think I get what you're trying to say - key point - you can't equate every 2 point change in SG with x percent change in Mg.
The two easiest ways to increase water salinity are:
So - yes - I just said the way it was worded confused me. Isn't the easiest thing to just measure that Mg? Which likely - he/she would do anyway? - And - the difference in my tank between lets say a Mg of 1200 and 1300 would be 'none' of significance to the inhabitants. Its just my opinion - people are 'pretending' (no criticism, no offense) - that a Mg of 1248 is really 'that value' - s compared to 1270 or 1230, etc.
I have no clue - reading this - what you're actually trying to say. UNLESS - its this. Lets say you have 100 gallons of salt water - and 1 gallon evaporates (resulting in an increased salinity). If you replace it with 1 gallon of 'RODI' you will end up the same. So - you need to replace it with 'new mixed saltwater'. I think thats what you're saying. I also agree - you cant predict the Mg to the accuracy in the calculation mentioned above - due to the margin of error in the tests. I would adjust the salinity (how ever you want) - and then measure the other 'stuff' and adjust them as needed (Ca, Alkalinity, Mg). I think we are on the same wavelength. My main point was don't try to predict - just measure.
I might be wrong, but I believe it's linear or very close to linear. So that we can calculate that difference in mag considering it linear.
I guess he noticed his mag was low, checked his salinity and it was low as suspected. After all, mag is a major element that isn't consumed as fast as others like carbonates. soooo, he asked if he could calculate it that way and how to do it. After all, he would be raising his salinity, and maybe there was no reason to dose mag if the future value was going to be ok. In that case, I would double-check. If that value is correct (crazy tests), maybe I would dose 100 ppm to be higher ( I target 1350 ppm mag), but only if I already had mag supplement at home. IDK, but 1250 should still be ok.
