I have doubts about the keeping qualities of Mytol - the activity of ascorbic acid in water tends to die off pretty quickly without special tricks. Ryuji Suzuki's and Patrick Gainer's formulas deal with this in different ways. Inspired by Gainer, I deal with it by mixing a simple formula from dry ingredients every time I process.
750 ml water
8 ml 1% solution of phenidone in alcohol
3 g ascorbic acid
64 g sodium sulfite (2tbsp + 2tsp)
water to 1l
Delta 100 35mm: 74 F, 8 mins.
It has XTOL's qualities of fine grain and good accutance.