How on EARTH did we end up back here AGAIN?!
There is a calculation that provides a very accurate value for the solubility of paracetamol (acetaminophen) in dH2O but Table 2 is sufficient to draw a graph that is ±5% - an acceptable deviation.
Meanwhile, at 0°C,
100mg of codeine phosphate will dissolve in
each mL of water. I have the physical book from 1921 but solubility is stated in parts i.e.
0°C ten parts water (100mg/mL)
5°C eight parts water (125mg/mL)
10°C six and a quarter parts of water (160mg/mL)
15°C five parts of water (200mg/mL)
2O°C four parts of water (250mg/mL) - considered STP
25°C three and one fifth parts of water (310mg/mL)
30°C two and a half parts of water. (400mg/mL)
But I hope we get the picture - codeine phosphate is several orders of magnitude more soluble in dH2O than paracetamol (acetaminophen).
You cannot cleanly remove ALL of the paracetamol but you can ensure you aren't consuming a toxic dose. Even then a methionine supplement might be a good idea if you do this a lot.
If you really need to remove al of the paracetamol., krokodil addicts in Russia dissolved 20 (or multiples of 20) paracetamol and codeine tablets into hot water, filtered after cooling (which removes 90% of the paracetmol if you use less than 400mL of dH2O. Then added caustic soda and used gasoline to extract the freebase codeine which was salted with brick cleaner (hydrochloric acid).
But I do not consider this to be a safe idea but stay under 400mL, filter as it cools and chill until ice just starts to form. You can get down to -4°C because the presence of codeine phosphate depresses the freezing-point.
I suppose on one hand it's easy to scale, on the other the product is impure and the crazy RP/I route Russians use to convert codeine to Krokodil N-demethylates and since phosphine (hightly toxic) is a side-product, phosphoramides are an inevitable side-product (the one that causes tissue necrosis).