Water storage Q's

[ashhhh]

ok, i have a 200L drum I will be filling and using for water changes on my tanks and need some advice,
when I do my partial water changes I will not be using all the water from the drum, maybe only 1/2 and I will just top up what I have taken from the drum. What will be better to stop the water from going 'stale' whilst its being stored between tank water changes.....airation or a powerhead...?

any advice muchly appreciated, thanks guys :D

ps. it will be in a shady spot under the patio, so no sun will get to it

[wrk21]

just drop an airstone in the bottom to keep the water circulating.


the more airation will also help get rid of the chlorine..


 ))o