Effect of salinity on parameters

[gatekeeperdi]

Hi,
Please can someone tell me if there is a calculator available to predict what the concentration of a saltwater parameter, e.g. Calcium, if the salinity increased or decreased. I am sure that I have seen charts showing this somewhere but can't seem to find any now.

I have just done my weekly tank tests and noticed that they were a bit lower than last week. The salinity has also dropped slightly. I use the balling method to dose Carbonate, Calcium and Magnesium. If I make up the next batch of saltwater for a water change that is slightly higher in salinity, would I just continue to dose the original amounts of my balling additives?

Thanks, Di

 

[redfishbluefish]

There are a couple ways this can be calculated, but what I'd do is to set up a simple ratio. As an example, let's assume we know calcium is 400 when salinity is at 35 ppt. And now we would like to know what it would be at 32 ppt. Set up the ratio with X being the unknown calcium number:

32/35 = X/400

Solving....400 x 32/35 = X

X = 366


This ratio thing can be done with any component. Hope this helps.

 

[gatekeeperdi]

There are a couple ways this can be calculated, but what I'd do is to set up a simple ratio. As an example, let's assume we know calcium is 400 when salinity is at 35 ppt. And now we would like to know what it would be at 32 ppt. Set up the ratio with X being the unknown calcium number:

32/35 = X/400

Solving....400 x 32/35 = X

X = 366


This ratio thing can be done with any component. Hope this helps.

Hi, thanks for that. It should have been pretty obvious to do it that way but my Maths brain was on holiday this morning.