Originally Posted by redsky49
From the perspective of HVAC
and air quality/safety, while Legionella is possible, it is not the primary worry. Bacteria is likely to be present however, and there are likely various contaminants, including heavy metals, often found in condensate.
Best operating practices should include keeping the evaporator coil clean, ensuring positive drainage of the condensate pan, and periodically cleaning
and sterilizing the pan. Biocides are available for this with wide spectrum capability.
dedicated condensate sump would be a good approach if you are able to drain both units by gravity to a single
Bit of a stretch to start talking of Legionella. It does not breed in the condensate, partially because it is unlikely to be there (naturally occurring bacteria in soil etc) but essentially, it needs 30-45 degrees C to breed. You must be thinking of the cooling towers used in the commercial
a/c units for heat rejection.
Also, no idea where you are getting your heavy metals, condensate from a/c comes out of the air, you must be in a toxic environment!
Tea Tree oil
and other natural biocides are great for the mould that will grow.
Avoid the wild stories of needing chlorine (bleach) to kill the legionella though, partly you are unlikely to have it and partly because it does not do much anyway, except chew through various metal components. Cleaning
the lint, mould and general grot is the best way to keep things healthy, topped off with the eucalyptus oil
for a great fish