It is recommended to use a dry diaper pail as this is much easier. Putting water in the diaper pail makes it very heavy to carry to the laundry room and it is a drowning hazard for small children.
Using a diaper pail liner makes it even more convenient and easy! It will keep your diaper pail cleaner and on laundry day you can take everything to the washing machine and dump it all in - even the diaper pail liner. If you have 2 diaper pail liners, then you will have one to use while the other is being laundered.
Using a diaper pail with a tight fitting lid will help keep odors in the pail. Be sure to wash dirty diapers every 2-3 days.