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NO3
05/30/2018, 08:38 PM
How when I know when my Kalk slurry is no longer useful?

My setup:
I have a 15gal gravity fed top off with a manual float valve in sump. I just added 1/4 cup of Kalk to the 15gal top off and let it settle. I have a 1/4" waterline drawing thru a gravity siphon top off water leaving about 3in of slurry on the bottom.

When will I know to dump the 3in Kalk slurry?
Dump every time when I fill the 15g top off??
Run a Dkh test on the clear Kalk liquid every time AFTER I fill the 15g top off? (below 12 Dkh, dump it?)

Your advice welcomed, please and thank you
Bear with me as I'm trying to change how I react to differing opinions

jamie1981
05/30/2018, 10:04 PM
Just add more kalk or replace it each time. I just throw a small scoop of kalk in every day or so and manually mix when I do my daily fish feeding. I use a small 10 gallon top-off reservoir with a float valve in my sump also. Because kalk can tend to clog float valves over time my system also has a float switch that will trigger a BRS top off doser as a backup should the water level fall too low in the sump. My system is rather large so it is filled automatically daily.

I mainly have SPS and run a large Korallin C-10002 reactor along with the kalk to help keep the pH higher.

Trying to test the potency of kalk slurry is going to be a hassle and Kalk is cheap.

nereefpat
05/31/2018, 09:04 AM
You can check the concentration of kalk in the solution by measuring pH. Fully saturated kalk should have a pH of about 12.

According to bertoni here,

"each time the concentration of Kalk is cut in half, the pH of the solution will drop by 0.3 units (log102)."

I think most of us just dump more in and add more water though.

Tripod1404
05/31/2018, 09:50 AM
Like jamie1981 said, I just add equivalent amount of kalk each time I refill the ATO reservoir. Say if you added 10 scoops to 10 gallons of reservoir and it dropped to 7 gallons, I add 3 gallon water and 3 scoops of kalk (values are arbitrary here). Once every 3-4 months, I completely siphon everything and put in fresh mixture.


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NO3
05/31/2018, 09:54 AM
Thanks everyone!!!!

I had a rough week on RC being over sensitive and commented in ways im not proud of

I trying to change my ways going forward.

jamie1981
05/31/2018, 10:15 AM
IF you want to save a bit on the kalk you can use Mrs. Wages Pickling Lime instead. It's the exact same stuff (calcium hydroxide) just food grade and less than half the cost of kalk sold specifically for the reef hobby.

https://www.amazon.com/gp/product/B0084LZU1Q/ref=ox_sc_act_title_1?smid=ATVPDKIKX0DER&psc=1

ca1ore
05/31/2018, 11:48 AM
Just another data point ....

Since I switched to a kalk stir device that actually works (as opposed to all the ones I made that didn't :lol:), I find that I don't get that insoluble kalk slurry at the bottom of the cylinder. Perhaps the constant stirring action means that it all dissolves .... dunno. Works well though.

Tripod1404
05/31/2018, 12:52 PM
Just another data point ....

Since I switched to a kalk stir device that actually works (as opposed to all the ones I made that didn't :lol:), I find that I don't get that insoluble kalk slurry at the bottom of the cylinder. Perhaps the constant stirring action means that it all dissolves .... dunno. Works well though.

Thats a great idea! Whats the name of the device?

ca1ore
05/31/2018, 02:04 PM
I'm using the avast marine one .... bit there's probably others.