Warren, if the drainage is good, what do you think about sterilizing
it with steam, then coating the inside with a non-permeable paint or
plaster?
I had both mildew in the cellar of my earlier house and a friend who
was a microbiologist (for the department of Interior - working on the
very strange organisms that could grow in lead and tin mine runoff
areas). She told me that the only practical way to get rid of mildew
was household bleach. Applied full strength and possibly repeated.
I'm not sure you can get that tank and its surrounding dirt hot enough
with any steam treatment to do any good.
Note: the old septic tank abandoned last year here had to be, by
health department regulation, crushed and filled in with dirt or the
like. I'm now left with a sunken place at the rear porch steps that I
need to fill in further.
Roy
Roy Morgan
k1lky AT earthlink.net
Lovettsville, VA 20180