It will be easier to get rid of the frogs while they're still tadpoles than when they're adult frogs....If you have a way to circulate water (submersible pump?) you could always add chlorine and circulate it around even without opening. Is that a cover on top with water on it? If so, can you get the water at least off the cover? How long before you're ready to open? I think if it were mine and I would be opening in a few weeks, I would just deal with it all then. However, if we're talking months, I think I'd find a way to get some chlorine circulated in there, even if the filter isn't running--it would at least kill the wildlife.
Janet
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