I just keep adding but took it off my ato after an incident with my skimmer overflowing and dumped my kalk into the tank. I run it in a Geo reactor with a standard alone dosing pump.
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It's fine, you can leave the old in there and mix a new batch up with it. I rinse out the bucket and pump a few times a year, that's it.i was going to try just adding water with the old kalk but wasn't sure if it was going to be potent as a fresh batch of kalk
I'm coming to yah house to get some!!!