So, I descaled my truckmount for the first time(500hrs). It wasn't so bad, actually pretty easy.
I always thought scale or chem build up would be white looking from the soapfree we run through the hx.
I had no clumps or chunks of stuff in any filters. Just rust stains from the hard water. Even with a softener in our house, we still get rust stains on stuff from our galvanized pipes(Very OLD house).
My question: Is scale build up or chem residue rust color?