Two fish people I talked to thought that the chemicals would be good even after a year, depending on storage conditions (they both said they use them until they're gone). The individual testing kits I have are well over a year and give the same results as those in the Master Kit, which is about 5 months old (I wipe off the residue on them).
I also have a few of Nutrifin's testing kits, and even though they were more expensive and allow for fewer tests, one of the reasons I decided to buy them is because they do have definite expiration dates on them.


