Salt Raising Alkalinity Question

[JAMSOURY]

Kind of a math question but it’s been hurting my brain to try to figure this out. If I have my alk at 8.5 dkh in a 200 gallon tank. Say I did a water change of 30 gallons with the salt having 10dkh. How much will it raise my tank salt by?

There has got to be some type of formula out there lol

 

[Edp251]

final alk would be roughly 8.8. Hope that helps

 

[Greg P]

((170*8.5)+(30*10))/200=8.725
Asterisks are Xs

((170x8.5 etc

This is your total volume of 200 minus the new water, so 200 - 30 = 170

170 parts @ 8.5
+ 30 parts @ 10
divided by tank volume of 200

 

[Greg P]

Make sense?

 

[JAMSOURY]

Make sense?

Perfect! Exactly what I was trying to come up with but I kept getting lost. Thank you so much.

 

[Greg P]

Perfect! Exactly what I was trying to come up with but I kept getting lost. Thank you so much.

You're welcome
Something else you may find useful ....

I used to struggle adjusting new water. I found Instant Ocean Regular and Red Sea Blue Bucket both hold true to this ...
4.9923mls of salt will raise one gallon of water by 0.001
So 25 gallons of new water @ 1.025 which needs to be 1.026 needs 124.81mls of salt

4.9923 x 25 = 124.8075
I base that off my adding 3375mls salt to make 26 gallons and it works every time.
And each time I need that above formula for a correction it still works.

I'd add too much salt, then add more RO, then get stuck in a loop !!

 

[Greg P]

BTW, that 4.9923 does not take into account how compacted or loose your salt is, use it at your discretion.
I haven't taken the time yet to weigh out a whole bucket of salt to do the math.
I would need to weigh that 4.9923 to get a true formula and ....
Well, I guess I could find the time while we're all shut down !!

 

[Albertan22]

You're welcome
Something else you may find useful ....

I used to struggle adjusting new water. I found Instant Ocean Regular and Red Sea Blue Bucket both hold true to this ...
4.9923mls of salt will raise one gallon of water by 0.001
So 25 gallons of new water @ 1.025 which needs to be 1.026 needs 124.81mls of salt

4.9923 x 25 = 124.8075
I base that off my adding 3375mls salt to make 26 gallons and it works every time.
And each time I need that above formula for a correction it still works.

I'd add too much salt, then add more RO, then get stuck in a loop !!

That’s very technical, I just grabbed a yogurt container to use as a scoop and figured out through trial and error that 5 scoops (about 4/5 full) gives me the perfect salinity every time if I fill my barrel to the same level with RODI water.

 

[Greg P]

That’s very technical, I just grabbed a yogurt container to use as a scoop and figured out through trial and error that 5 scoops (about 4/5 full) gives me the perfect salinity every time if I fill my barrel to the same level with RODI water.

I do the same, with a plastic measuring cup.
Most of the time, I scoop out 'X' number of cups and it works, but not always.
Then what .... so then I need the calculator.
As I stated above, from this point on I found adding more salt to be inconsistent as I'd add too much, then needed to add more water. Then the tub gets too full and now I'm pulling water out. AARG !!

Or, I want to use the water right now, not wait a half hour to re-test it to see if I added the correct amount.
Just got tired of adjusting blindly.

I can add the measured salt and go do something else while it mixes knowing that when I come back to re-test it the re-test will be correct.