Do test kits expire?

Thank you much. Looks like it is time to get some new kits!
"Carol-Ann" wrote in message
...

wrote in message
news:E0ubf.14069$gj1.10437@fed1read05...
Hi all...and thanks for all the great threads and solutions....

Do test kit chemicals expire? If so....anyone have an idea as to how
long
they are good?
I test for:
Amonia,
Nitrates
Genral Hardness
pH
==================
I keep mine in a cool dry place for no more than 2 to 3 years. Accuracy
measured against new kits is not off much, and sometimes not at all. :-)
--
Reel McKoi.... frugal ponding since 1995...
My Pond & Aquarium Pages:
http://bellsouthpwp.net/s/h/shastadaisy
~~~ }((((o ~~~ }{{{{o ~~~ }(((((o

wrote:
Thank you much. Looks like it is time to get some new kits!
"Carol-Ann" wrote in message
...

I don't believe the chemicals themselves decompose with age, but I've
had them dry out even with the bottles sealed tightly. The plastic in
some bottles can also deteriorate and crack after many years.

- Logic316



"Those who beat their swords into plowshares will plow for those who don't."

"Logic316" wrote in message
...
wrote:
Thank you much. Looks like it is time to get some new kits!
"Carol-Ann" wrote in message
...

I don't believe the chemicals themselves decompose with age, but I've had
them dry out even with the bottles sealed tightly. The plastic in some
bottles can also deteriorate and crack after many years.
==========================
I know some people keep them for years. I don't. Whatever is left after
the 2nd or 3rd year I toss and replace. That's probably being wasteful as
when compared to new kits they're always so very close. Some people
recommend replacing the kits after a year. I disagree with that.
--
My Pond & Aquarium Pages:
http://bellsouthpwp.net/s/h/shastadaisy
~~~ }((((o ~~~ }{{{{o ~~~ }(((((o