Gardening blunder, possibly the most acidic soil on You Tube and my attempt to rescue it for reuse.

This is possibly the most acidic soil mix on you tube and my blunder made it that way. I only discovered it when all my tomato plants started to die off. If I'd checked the soil mix pH before I'd planted the tomatoes in it this wouldn't have happened. I was minded to dump the mix but have been persuaded that I might be able to able to use it again next year If can adjust the pH from being extremely acidic at an 'off scale' 3.5 to one of 6 to 7, just slightly acidic. Here we go!