Salifert alk test kit
I have had my test kit for a while now over a year because I was in the planning stages of my new set up .I was wondering do these kits expire.
The reason I ask is when I do the test I get a reading of about 12DkH
but when I go to get it tested It comes back at off the scale ,when I use my even older aquarium pharm test kit it measures 16DkH.
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