-> I know that from personal experience (Dow Chemical; I'm an engineer)
-> that chlorine  with water is corrosive to metals.  My concrete perch
-> has a cad plated steel threaded rod in it for support.  This rod
This does make sense..I have a concrete floor in my aviary and know that
there are medal rebar under the concrete.  I have been cleaning with
chlorine mixed with water for about 6 years and have not seen any signs
of stress or cracks......yet..Let's hope my luck hold out..
--- WILDMAIL!/WC v4.12 
---------------