I float dish cleaning pads in my sump for similar purposes. That is, to seed new tanks for QT or emergencies. Works great. I've done it a few times. The great thing about them I find is that they float rather than sink so they don't trap detritus like foam pads tend to. I've got pads that have been in there for years that are pristine (minus the bacterial coating and the Copepods living in them).
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