This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 泴 is uncertain. It visually combines 水 (water) and 皿 (dish), but the original meaning and component relationship are unclear.
Water 水 over a dish 皿 suggests washing or purifying, but the actual meaning is uncertain.
For カン, imagine a can of water being poured over a dish: can -> カン, and the water cleanses the dish.