High dkh after water change?

[SamMule]

So, ive been monitoring my alkalinity for the last couple months on this tank. Has been pretty stable ranging from 8.9-9.5dkh.
I tested yesterday a couple hours after a water change and it was 11.0. Yikes! Changed another 5 gallons and it dropped to 10.7.
Tested again today about 24hrs later and it is back down to 9.3.
No corals (not even my acro) have showed any sign of stress during this whole ordeal. All of my SPS actually seems to have better polyp extension than it did before the change.
I'm wondering of testing my alkalinity immediately after a water change will give me erroneous results?
All testing has been done with a Hannah tester.

 

[WIReefer]

So, ive been monitoring my alkalinity for the last couple months on this tank. Has been pretty stable ranging from 8.9-9.5dkh.
I tested yesterday a couple hours after a water change and it was 11.0. Yikes! Changed another 5 gallons and it dropped to 10.7.
Tested again today about 24hrs later and it is back down to 9.3.
No corals (not even my acro) have showed any sign of stress during this whole ordeal. All of my SPS actually seems to have better polyp extension than it did before the change.
I'm wondering of testing my alkalinity immediately after a water change will give me erroneous results?
All testing has been done with a Hannah tester.

Hanna Alk is my favorite! And it could have possibly been a testing error. How long did you mix salt up for before making the water change?

 

[SamMule]

5 hours or so. Red sea coral pro. I was thinking it may be due to salt not being totally dissolved

 

[ZoaAddiction81]

Red Sea Coral Pro Has A Higher Alk I Believe

 

[SamMule]

Yes, it does. Box says like 11dkh @ 35ppt. But that's with 100% fresh salt water. I only did a 10 gallon change in a 65g system.
Considering I tested twice yesterday and the results were within .3dkh, I think my tests were good.
I would just like to know if testing after a fresh salt mix will throw my results off.

 

[jsvand5]

I’d dump the coral pro and start using the Red Sea blue bucket.

From what I remember, the coral pro has very specific mixing instructions.

 

[ZoaAddiction81]

I would test the new water you mix up with the Hanna before pouring into tank.Do you check your alkalinity around the same time In your system?

 

[piranhaman00]

Testing error is my guess. Did you test the fresh salt water alk?

 

[blasterman]

"Very specific mixing instructions"

Like, using a pump powered by a flux capacitor? It's called adding water and providing circulation. Salt mix is salt mix, it's not FDA regulated, and only differs in the ratio of ingredients.

I would test some fresh salt to verify dKH because salt mixes can verify from bag to bag and even within a a bag. Sometimes they dont get mixed propery at the factory and you end up with lumps of ingredients.

 

[SamMule]

I tested the tank the day before. It was low 9's. Maybe 9.1?
The coral pro does have specific mixing instructions, and I have been following them with no problems. I don't wanna get caught up chasing numbers and changing things around because of a couple weird tests. If it ain't broke, don't fix it, right?
Like I said everything is very happy, so I don't want to change anything.

 

[SamMule]

"Very specific mixing instructions"

Like, using a pump powered by a flux capacitor? It's called adding water and providing circulation. Salt mix is salt mix, it's not FDA regulated, and only differs in the ratio of ingredients.

I would test some fresh salt to verify dKH because salt mixes can verify from bag to bag and even within a a bag. Sometimes they dont get mixed propery at the factory and you end up with lumps of ingredients.

Yeah, they are specific about mixing temperature and times to reduce precipitation. I don't mind. Its pretty easy lol.

 

[SamMule]

Just tested the mix leftover from yesterday. 10.6.
Maybe it just takes time for it to equalize throughout the tank?

 

[Flippers4pups]

I would let newly made saltwater mix at least over night (8 hours) with any salt mix before using it.

I agree, test a newly made batch for alkalinity, after it sits overnight.

Edit: you beat me to it.

 

[WIReefer]

I would let newly made saltwater mix at least over night (8 hours) with any salt mix before using it.

I agree, test a newly made batch for alkalinity, after it sits overnight.

You beat me to it! Lol

 

[Flippers4pups]

You beat me to it! Lol

 

[SamMule]

I'll try that next time.
I don't usually test immediately after the change, but was going to dial in my kalk dosing. Threw me for a bit of a loop haha

 

[Thespammailaccount]

So, ive been monitoring my alkalinity for the last couple months on this tank. Has been pretty stable ranging from 8.9-9.5dkh.
I tested yesterday a couple hours after a water change and it was 11.0. Yikes! Changed another 5 gallons and it dropped to 10.7.
Tested again today about 24hrs later and it is back down to 9.3.
No corals (not even my acro) have showed any sign of stress during this whole ordeal. All of my SPS actually seems to have better polyp extension than it did before the change.
I'm wondering of testing my alkalinity immediately after a water change will give me erroneous results?
All testing has been done with a Hannah tester.

The alk for Red Sea coral pro runs on the higher side. Newly made salt would read around 11.5. To prevent alk swings I would dose the tank to around 11.5

 

[SamMule]

Yeah, I wanted to raise it to help with SPS growth, but not that fast!

 

[jsvand5]

I would let newly made saltwater mix at least over night (8 hours) with any salt mix before using it.

I agree, test a newly made batch for alkalinity, after it sits overnight.

Edit: you beat me to it.

That’s not the case with coral pro. You are supposed to use it immediately after it’s dissolved and mix it in Un heated water or the mix precipitates.

 

[Flippers4pups]