Note, and always remember these significant points. Very important.
1) If you are in the western hemisphere, snake's head should always be kept pointing to GMT time zone. Meaning due east.
2) If you are in the eastern hemisphere, snake's head should always be pointing to GMT time zone, in this case, due west.
3) If in The GMT time zone, and in the northern hemisphere, snake's head should be pointed towards the tropic of cancer.
4) If in the GMT time zone, but in the southern hemisphere, snake's head should be pointed toward the tropic of capricorn.
5) If in the GMT time zone, and on or near the equator (between the tropics of cancer and capricorn)...and this is very significant...keep snake's head pointed up, towards the sky, snake at perfect perpendicular to surface of the earth at the point where you are bathing or soaking. This requires an upright bathing or soaking chamber, but the snake's sense of direction is at stake here, and it is worth the effort.
6) pH should be a measured 7.0.
7) Salinity between 0 and 0.90%.
8) Temperature 65-75F.
9) And lastly, hard water is much preferable than soft water. You don't want your snake feeling all slippery and slimey after a bath or soak, as it is very depressing to the snake (and rather repugnant to humans). The psychological trauma, of course, is immeasurable in reptiles...and to be avoided if possible.