It depends on the amount of time you are using, the amount of beans you are using, the size of the bean, the kind of the bean,etc.
It depends on what wood it is. For example pine absorbs a lot but teak absorbs a little because teak is much denser
Cotton absorbs 224 milliliters of water ( 225 mL is 8 fl oz)
There are much spaces between the different individual sand particles, thus allowing water to be able to seep through quickly and dig