Help! - Salifert Test Kits and IO Salt

[dbdavid]

I was just testing my water parameters and grabbed my new Salifert Alk test kit by mistake as I still have a few tests in my old kit. Anyway I tested with the new one and my alk is 4.5dkh! I went and tested with my old one and got 8.0 dkh!

I mixed some new salt a couple days ago so I thought I would test it to see which test kit is out. Well I got 15.7 dkh! with the new test kit and the old test kit wouldn't even change on 1ml so I refilled it with reagent #2 and it took to .63ml to change the colour(1.63ml).

The salt is IO and is a couple of years old, I bought a whole bunch on sale.
My calcium is at 310 and tested at 380 last week.
PH is around 7.8 - 8.0
Phosphate is 0

So I am assuming that the old kit is not accurate and that my bucket of IO salt is bad as well.

Any comments would be appreciated.

Dave