Hello all,How long would you expect a water test kit (NT Labs) to last once opened? Assuming of course you don't use it all first.I've been getting some strange readings and despite water changes and reduces feeding nothing changed, so bought myself another kit and all readings are within limits again.

I believe it was only open end of last summer but time flies so may be longer. The end of use date is Nov 2018 on the box. Will write the opening date on the new kit this time.Thanks.

I didn't find the right solution from the internet.

References:

- https://www.pond-life.me.uk/forum/viewtopic.php?f=27&t=16508

-  Data Management Video  Examples