Just thought I'd share two tips that worked fairly well to recover from a bad wine day.
1/. I bought the cheapest cask wine called Daybreak, and I couldn't drink it (some Daybreak varieties are OK, this was not).
So I experimented by running it through a Britta jug at least five time, it seriously improved it and saved 20 Lt from being tossed. I found 17 Lt of red wine is the upper limit per filter.
2/. I recently got Berri Traditional Red cask twice 'Best Before 16 & 17/Oct/17'. 3 out of 7 5Lt casks were off. Got stomach pain. So I pulled out a pressure cooker and boiled for two minutes. It definately sterilized the wine, and no tummy ache.
Using an open pan with a rolling boil for one minute minimum should work, and leave 60 or 70% of alc. From what I've read.
I had 9 Lts so didn't want to waste.
Yeah.oxidized cheap wine makes to smoother tasting and not so sharp