Boiler cleaning plan

Bill H.

This Fall I want to use a Rhomar Hydrosolve 9100 boiler cleaner to clean up my hydronic closed loop baseboard system. I must drain 1 gallon, and add the 1 gallon of cleaner. The fresh water supply valve must of course be closed. I plan to open up my Spirovent air extractor to vent the system temporarily, then drain off water at bottom of unit. After draining off the water, I plan to slowly pour the cleaner liquid into the open top of the Spirovent and hopefully minimize any trapped air. After replacing the top, the boiler will be placed back on line and system run in heat mode for several days before draining and refilling with fresh water. I don't think I can drain much water unless I do the above venting ( water in a straw effect ). Any comments on this will be appreciated. Thanks