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I still have some 10 year old alkalinity test kits and they still are perfect.
If the reagents have not been tightly sealed and has been sitting like that for several years then deviations are very likely.
But if the value is actually 6 dKH and you get 3 dKH then a LOT of reagent must have been evaporated.
Perhaps it might be worthwile to double check if you have followed the procedure correctly since it has been several years ago that you have used this kit.
A few things that come up in my mind are.
- correct sample volume
- did you read the remaining volume?
- is it dKH or is it meq/L
If you did every thing correct and the value you obtain is 3 dKH then you had to dose only approx 0.2 ml (0.8 ml remaining).
Is this the amount you had to dose to obtain a color change?
__________________
"I'm a big dumb stupid head." - Beerbutt
Proud owner of the very rare YET (Yellow Elephantis Tang) from the Lord Bibah Islands.
"LOL, well I have no brain apparently. " - dc (Debi)
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