Two part and salinity

[pharazon]

Hello!

I tried googling this and found lots of discussion, but not an equation or calculator to help me figure out my values. I apologize in advance if this is redundant.

I am dosing 26 ml of ESV B-Ionic for 25 gallons of gross water volume, so approximately 2.2 dKH. I’ve noticed my salinity tends to creep up between water changes. I use a calibrated Veegee STX-3, so I’m pretty confident in the readings.

My target is always 35 PPT. How much tank water should I be swapping for fresh each week to correct the increase? Or rather, where can I find a calculator or equation to help me determine this.

As always, thanks for the help!

 

[GoVols]

Hello!

I tried googling this and found lots of discussion, but not an equation or calculator to help me figure out my values. I apologize in advance if this is redundant.

I am dosing 26 ml of ESV B-Ionic for 25 gallons of gross water volume, so approximately 2.2 dKH. I’ve noticed my salinity tends to creep up between water changes. I use a calibrated Veegee STX-3, so I’m pretty confident in the readings.

My target is always 35 PPT. How much tank water should I be swapping for fresh each week to correct the increase? Or rather, where can I find a calculator or equation to help me determine this.

As always, thanks for the help!

I use the same Vee Gee and they are great. Worth every penny.

Two part or full balling does raise your salinity, as you know.

I used to mix new saltwater under .35 for weekly water changes before moving on to a cal reactor.

Would love to see a formula or calculator as well.

 

[fermentedhiker]

I've never seen a calculator either. You could just do trial an error plotting like you did for your dosing schedule except for SG. remove a certain amount of tank water each day which your ATO will replace. Increasing it until it gives your a stable SG maybe? There should be a way to calculate how much a given DKH usage will raise Salinity though. Alternatively skim a little wetter and it'll probably be pretty close.

 

[Randy Holmes-Farley]

There is no calculator, but I did the math for my diy here. In short, salinity rises by about 32% over a year of adding 1.1 dKH per day.


Residue Remaining from Recipe #1 when using Recipe #1, Part 3A
After one year of adding 8 ppm of calcium and the accompanying 0.4 meq/L (1.1 dKH) of alkalinity per day (41 mL of both parts per day or 4 gallons of both parts per year in a 50-gallon aquarium, including the effect of the magnesium part #3A, 2440 mL/year), the following residue (Table 2) would remain after calcification and adjustment for salinity (there is roughly a 32% rise in salinity over a year using this addition rate without water changes).