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  #1  
Old 05-19-2017, 09:14 PM
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Default Salinity water change formula

So I am not sure if anyone has ever sat down and figured out a formula to slightly increase or decrease your salinity but I did so I figured I would share. It is:

[(Desired gravity * total system gallons) - (system gallons after taking water out for water change * current gravity)] / gallons of water change = water change gravity

Example:

I have 1.024 salinity in my system and I want 1.025 and I have 225 gallons in my system. I do a 20 gallon water change so the math is:

[(1.025*225)-(205*1.024)]/20=1.035

Hope this helps!
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  #2  
Old 05-19-2017, 09:29 PM
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Default

And before everyone goes crazy about calcium, KH, etc I use a few different salts for what I'm trying to fix (normally adjust my salinity back to 1.025 every 3-6 months if it gets off) I use a lower KH salt when adjusting salinity so I don't burn my sps unless I need to bring KH or ph up then I use a salt like reef crystals when doing it. Again advanced topics so I would hope you guys see the big picture.
  #3  
Old 06-18-2017, 11:34 AM
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Default More formulas

Here are a series of formulas. They work with PPT, not sure about SG.

TV= Tank Volume
C= Change amount TV*(ES-SS)/(CS-SS)
SS= starting salinity
ES= ending salinity +(((TV-CA)*SS)+(CS*CA))/2
CS= Salinity of water change +((TV*ES)-(TV-CA)*SS)/CA
I have them set up in an excel spreadsheet and just enter the known data.
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