Alkalinity is high and need some help

[dwfain]

I have a 75 gal mixed reef tank with fish. It has a trigger sump. My alkalinity has been pretty stable but the last 2 weeks it is slowly creeping up. All my parameters are steady except alkalinity. I do a 10-20% water change every 2 weeks. I use Red Sea Coral Pro salt. I have my automatic doser set to stop dosing if the level reaches 11. Any thoughts? The actual Salt reading is closer to 32, it had some micro bubbles.

 

[dwfain]

I have a 75 gal mixed reef tank with fish. It has a trigger sump. My alkalinity has been pretty stable but the last 2 weeks it is slowly creeping up. All my parameters are steady except alkalinity. I do a 10-20% water change every 2 weeks. I use Red Sea Coral Pro salt. I have my automatic doser set to stop dosing if the level reaches 11. Any thoughts? The actual Salt reading is closer to 32, it had some micro bubbles.

Here is the updated graph after clearing the micro bubbles.

 

[SPR1968]

The Coral Pro salt mixes to around 11-12 dKH Alkalinity so if your doing water changes with it, it will creep up to that level

 

[dwfain]

The Coral Pro salt mixes to around 11-12 dKH Alkalinity so if your doing water changes with it, it will creep up to that level

But it is 14.4 and rising and the dosing is off.

 

[dwest]

I would verify the alkalinity reading with a Hanna or salifert test kit. Or have LFS check it for you.

 

[Randy Holmes-Farley Verified Community Expert]

Did you measure the alkalinity in the salt as you make it?

 

[dwfain]

Did you measure the alkalinity in the salt as you make it?

I did not, I just checked the salinity.

 

[dwfain]

BTW, same salt, same dosing, same maintenance schedule, same coral and livestock and my other 75 is at 10.39.