Cleanworks
Moderator
My lg 3ht heater seemed to be losing heat so it seemed a good time to descale it. I took an old pump out and hooked it up to the cold water inlet and put the return line back in the pump out ( you could use a 5 gal bucket with a sump pump) I put in 3 gallons of descaling fluid in and and turned on the pump. The solution was clear to start, if you look at the last pic, that's after running the pump for 2 hours. I am sure this will work for any type of heating system. Just put some t connections on your inlet/outlet and let the descaler circulate for a couple of hours.