a 12" square hole (reciprocating saw) outta do it. I personally prefer 1" spade bit
on a cordless when my ponds froze over. Ingrid

"NetMax" wrote:

I imagine that some holes would need to be drilled through this ice cap
for O2/CO2 exchange. The surface is 320 sq.ft. Anyone have suggestions
on hole diameter, quantity and distribution?
tia



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