Expired Hanna checker reagents

[Tonii]

Good evening guys,

Just bought a used Hanna phosphate checker. It came with a few reagents but they are expired 10/2015. Can those reagents still be used a get an accurate reading or am I better off buying new ones?


Thanks for the help...

 

[justingraham]

U can use them but I wouldn't trust them buy new so u know it's accurate

 

[anthonys51]

yes i had a friend use old ones, i gave him one of my new ones and the test results was 1dkh off .

 

[MmmmBalf]

I have a friend that's been using phosphate reagents that expired in 2014. Couple weeks ago he purchased new reagents, tried both and they came up exactly the same. I'd still get new ones when you can though for piece of mind.

 

[Sabellafella]

Good evening guys,

Just bought a used Hanna phosphate checker. It came with a few reagents but they are expired 10/2015. Can those reagents still be used a get an accurate reading or am I better off buying new ones?


Thanks for the help...

I mean not so much accurate but ive used long overdue phosphate reagents before and they seemed to be inline with brand new ones. But thats my experience

 

[Tonii]

I ended up ordering some new ones. I used the expired ones 4 times in a period of a week and a half. The first reading was .16 and then a couple days later .00 and it has been reading .00 for the last three times I tested the water. Im very sure my phosphates are not 0 since I have a little of GHA in one of my rocks and algae in the glass.

 

[justingraham]

All could also be a false negative in that ur gha is absorbing all ur phosphates. But yes it is a good place to start getting new

 

[Frop]

I just bought a Hanna checker used. Alk reagent expired 3 months ago. Wasn't sure if anyone had any experience with the alk test. Yesterday it tested 139ppm (7.8dKh) and today after an approx 15% water change the exact same number (I waited more than an hour after the WC to test so everything mixed well).