How much potassium?

[mrbacony]

I have been testing both of my tanks using Salifert K test kit over the last few weeks. It is consistently showing K at 340-350. I am considering starting to does some K. How much should I look at adding and which brand would you use? I do not need any more nitrates so I am looking for something without them.

For reference, one tank is 130 gallons and the other is 32.

 

[X-37B]

First verify its actually that low. Reason I say this is I just sent out my first ICP and tested my K before and it read 360. I looked at my test kit, salifert, and it expired 3 years ago. Got a new one and it reads 410 which is normal. ICP came back 426 so good.
I have and use this if I need to raise it.

 

[mrbacony]

Thanks. This was actually one of the brands I was looking at using.
The test kit expires in 2023. I went back and looked at my last ICP test which was 9/21. It showed K at 471. I probably need to run another ICP test before I start dosing just to make sure. That is a huge gap.

 

[DrMMI]

I use the powder of potassium chloride from brightwell and make my own solution. It allows me to make it as concentrated as I want.

 

[Randy Holmes-Farley]

Thanks. This was actually one of the brands I was looking at using.
The test kit expires in 2023. I went back and looked at my last ICP test which was 9/21. It showed K at 471. I probably need to run another ICP test before I start dosing just to make sure. That is a huge gap.

Maybe try the kit on some new salt water at 35 ppt.

 

[Randy Holmes-Farley]

I use the powder of potassium chloride from brightwell and make my own solution. It allows me to make it as concentrated as I want.

FWIW, food grade potassium chloride is cheap and carries a guarantee of purity that the Brightwell products do not.

for example:

NOW Foods, Potassium Chloride Powder, 8 oz (227 g)

www.iherb.com