I had too drill a couple of 4" holes through a concrete block wall and I
lost the center bit for the coring saw twice. The first time I managed to
fish it out with a magnet. That's when I noticed that the bottom row of
blocks has about 6" of water in them. I thought this was a little strange,
should I worry about it? One wall has a funky green colouring near the
bottom, looks like algae, but it's probably mold.
I was going to drill some half inch holes to drain the water, but I'm not
sure this is a bright idea? The room is an entryway for an outside stairwell
and has it's own drain.