I've always wondered about the shelf life of K-meta powder. Everything I read says one year though it's also mentioned to throw it out after 3 years. My thoughts have always been if it's sealed what could go wrong with it. However this may not be the case. While recently adjusting the sulfites on my peach wine I had to add about 3 times the amount (using FermCalc) to get to the proper level of free SO2. I bought 5 lbs in September of 2020 but didn't open the package until June of last year so it's over a year old.
I'm going to order a lesser quantity and when it comes in I'm going to put measured amounts in 2 of the same wines and check the free SO2 just to check. I'm a little worried since I don't usually check the SO2 after putting in the recommended amounts and afraid I may have not me my desired levels in previously sulfited wines. The ones in bulk I can adjust I'm just concerned about the ones I bottled.
I'm going to order a lesser quantity and when it comes in I'm going to put measured amounts in 2 of the same wines and check the free SO2 just to check. I'm a little worried since I don't usually check the SO2 after putting in the recommended amounts and afraid I may have not me my desired levels in previously sulfited wines. The ones in bulk I can adjust I'm just concerned about the ones I bottled.