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My guess is that it would still work. You could stuff
the dry ice directly into the water flow I suppose.
I doesn't sound like this well is generating a lot of
pressure. Just take a chunk and push it into the water
flow.

My story is that I got a quote for 2.5K to repair the
leaking valve. All of the cost was digging up the street.
I already had a replacement valve.

My neighbor told me about this. 5 bucks worth of dry ice
vs. a $2500 repair bill.

Certainly seems worth a shot considering I can get dry ice for free from my
Peapod driver.

Good tip.

--
Bobby G.