Anti-freeze / boiler water treatment - Harman Hydroflex 60 Boiler

[melagoo]

Hi.
I was reading the install manual for my Harman Hydroflex 60 Boiler and came across something interesting.
It states the following:

Anti-freeze and / or boiler water treatment:
There is no restriction on the type of commercial antifreeze used. When filling the boiler water system, it is
recommended that some form of boiler water treatment be used.

Has anyone done this? What are the pros and cons of not adding it?
And, how would you do it if it wasn't done during installation (a year ago)?

Any input would be greatly appreciated. Thank you.

 

[pybyr]

This stuff is about as good a do-it-all package as I was able to find without getting exotic and expensive

Drain, flush add this stuff as you refill, make sure it is circulated around

http://www.rectorseal.com/index.php?site_id=1&product_id=172