Dometic a/c units flushing the water slide

I assume you mean the closed water cirquit to the chillers ?
I used just tap water, untill the water coming out on the other end was perfectly clean,
after finishing that, I filled the cirquit we premixed cooling liquid
 
Rydlyme, diluted as stated on the bottle then pumped around in a loop with a small pump.
I plan on doing mine soon with Barnacle Buster as I can’t seem to find Rydlyme in Spain.
 
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