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07/17/2010, 04:47 PM
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#1 |
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Registered Member
Join Date: Dec 2009
Location: Sugar Land TX, a suburb of Houston.
Posts: 168
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Expiration date on KH test solutions
I have 3 different bottles of KH test solution for measuring the carbonate hardness (alkalinity level.) The brand is not shown, but I am figuring that the LOT number must involve the date. I dunnofor sure but I suspect its in the form of XXXMOYR. I have three bottles with lot codes of:
59A1008 (written in black) 59A0408 (written in black) 59A0109 (written in yellow) Guessing Oct '08, April '08, Jan '09.... The three give radically different hardness measurements. I am guessing I should toss the two old ones, but how long are they to be used ? Pic sucks, but you can probably recognize the brand. 
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07/17/2010, 05:07 PM
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#2 |
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RC Mod
 Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 88,616
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That's going to be hard to guess with any confidence. I'd ask the manufacturer, if possible at all.
__________________
Jonathan Bertoni |
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07/18/2010, 05:06 PM
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#3 |
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Registered Member
Join Date: Jul 2006
Location: Moore , Oklahoma
Posts: 738
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pretty sure you are correct on the dates that API use but i think that is the date of manufacture and can be used up too 1 year after that.
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