deja,
I have to agree with Weedhound...I do about the same thing, except I change my containers each week, sometimes 2 weeks if I forget about them.. keeping some of the "old" water in the bottom of the container. This helps get/keep things going with the bacteria and essential goodies in each container. Much like changing your water in a fish tank, one never takes all the "old" water out when doing a water change/cleaning of the tank...this keeps things healthy the same way...

Peace,
Treetops :jointsmile: