Kalk like mud in stirrer, Why?

vtecintegra

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Using a K1 stirrer with BRS kalk. I've got about a cup in there. My alk and pH took a dive, and I've found the kalk is like thick mud. I can barely pull the stirrer out of the goop. Any idea what's going on? The stirrer is feed RODI.
 
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vtecintegra

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No, the motor on the stirrer is at a set rpm. Even running 24/7, the stirring paddle just cuts it a little grove into the blob of kalk that forms. I don't see the blob really dissolving, so the water seems like it drops below saturation level.

My alk went from the 9s to low 7, so I said what the heck? Checked the stirrer, and it's pretty much got the same level of kalk in the bottom from last month. Went to pull the stir rod out to make sure the paddle was still spinning, and it was like trying to pull your foot out of mud. The kalk is more like a jelly blob than a fluffy powder. So it looks like the rodi is going in, but the kalk isn't dissolving, doing it's job.

This is no good if the saturation can't be maintained. Maybe I've got too much kalk in there?
Kalk.jpg
 

Montiman

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I would test the kalk solution in the stirir to see the concentration. You can use an EC meter or pH. It may be working just fine and you might just need to add more kalk to the tank.

If it isn't working then checking the concentration will confirm for you.
 

AquamanE

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Ive got a K2 and try not to put more than 1/2 cup at a time. Keeps it stirred well. Also have a PH probe in that reactor. When full its at around 12.2….I let it go to 11, than just add a bit more to keep PH at 12. Once ph starts dropping quick..like within a week I just take it down and clean the whole think and start again…normally every 3 months or so.
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Randy Holmes-Farley

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pH is 11.8 in the stirrer. I'm seeing that 12.4 is considered saturated. So I guess the question is how undersaturated is 11.8?

About 25% saturated.
 
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Randy Holmes-Farley

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Thanks guys. I think to reliably run this thing long term, it needs a pH probe.

FWIW, a conductivity meter is a better way to monitor kalkwasser potency.
 

dwest

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I use a K2. Saturated kalk is clear. If it’s cloudy, then theres some solids too. Your mud looks just like mine.

A pH probe calibrated at 7 and 10 will not likely read the correct pH IME. When I was testing mine, I diluted some solution and used an alkalinity tester to verify it was close to saturation. You can verify this in Randy’s articles but I think saturated kalk near aquarium temperature should be about 100 dKH.
 
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vtecintegra

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Please confirm you are using RODI water...tap/well water can be high in calcium and help create mud.

My other thought looking at the picture is too much Kalk....the BRS stuff is a powder. lots of powder and water = mud.
Yeah, RODI. I pulled the stirrer out and and the kalk seemed to be about twice as thick as pudding.
 
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