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Discussion Starter · #1 ·
Does the liquid in the drop checker go bad? Do you have to change it periodically?
I have a drop checker filled with 4kh water and 4 drops ph regent and have had it in my tank for several months. My CO2 went out and I now have it working again but my drop checker doesn't seem to be changing color. I was wondering if this is due to the CO2 levels not being high enough yet or if the liquid has gone bad.
 
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