tel Posted May 31, 2006 Report Share Posted May 31, 2006 when running tests at low salinity how do i calculate the relative values? ie; Ca is 420 at 1.026. what would i expect at 1.020. is 1.026 30% saltier than 1.020?? :-? Quote Link to comment Share on other sites More sharing options...
wasp Posted May 31, 2006 Report Share Posted May 31, 2006 Basically, you would divide by 26 & multiply by 20. This will work if it is a straight exercise in maths. However, for me, because I believe in "other factors" that can sometimes exist, I always standardise my salinity to 1.025 before testing. That way I can look through past records & it's always on a par, one with another, and it's a real value, not a theoretical adjusted one. I do use a formula for testing NSW when I get it, the salinity can vary sometimes, I don't bother adjusting parameters in it, do that after it goes in the tank, but if on a given day if it is 1.028, ca 400, then it would be 400/28=14.29x25=ca standardised to 1.025 of 357. Then if I was into something like Chimeras calculator, I could calculate how much ca to add to the tank with the dilution top off to keep things where they were before. BTW that's just an example my tank runs higher than ca 400. Quote Link to comment Share on other sites More sharing options...
tel Posted May 31, 2006 Author Report Share Posted May 31, 2006 thanks wasp....tests look good Quote Link to comment Share on other sites More sharing options...
rossco Posted May 31, 2006 Report Share Posted May 31, 2006 More importantly - how's the fish? :-? Quote Link to comment Share on other sites More sharing options...
tel Posted June 3, 2006 Author Report Share Posted June 3, 2006 looking really good Quote Link to comment Share on other sites More sharing options...
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