Lfs asks for water to test, what is the best container to use

[Brant W]

i am pretty new to the hobby and after a fish a bought from an lfs died they asked for water samples. What container would be the best to use? also how much water do they normally want?

btw when i tested i didn't find anything wrong and they had two of the fish stocked and the one in store died around the same day

 

[BlennyTime]

If you have some disposable Tupperware that works well. Or if not, a small zip-top plastic bag would be fine.

It doesn’t have to be a lot of water. Maybe half a cup or so.

 

[Jekyl]

Anything clean. Maybe rinse it once with RO before tank water