Actually many people do use diatom filters 24/7 now.
In the old days the pumps were not made for 24/7 uses but now you can

http://www.diatomfilters.com

for more info

On Tue, 28 Dec 2004 15:09:59 GMT, (Richard) wrote:

No, you can't run diatoms 24x7. The filter media get clogged very quickly,
typically within a few hours. Diatom filters are used as occasional water
polishing filters, not as permanent filters.

Maybe you can't, but I can.

If your tank is so dirty it clogs a diatom filter in under a week or two
you have bigger problems than trying to make it crystal clear. Try some elbow
grease and big water changes.

Marc
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