Poconos, Maybe the black winter cover is keeping my ice down. I'm just outside Allentown but really 4" is the most I have measured.
The rubber expandible plug the pool store guy told you about is really a good idea. Imho.
we use them to seal toilet drains and sinks all the time. I doubt your main drain is threaded
so you may not have any other options.
Garden hose snorkel? Hmmmm I would think a few well held breaths
with a few trips to the bottom to install the plug would work better.
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