Name: Anne Summerville, SC (Zone 8a) Only dead fish go with the flow!
At my old house I clean mine out every few years .. my old one had a gravel floor so I always sprayed heavy duty weed killer on the floor and once that dried dusted it with diatomaceous earth.
Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.
Douglas Adams