An old fashioned tried and true method is to run a hose into your rig, drop into the toilet, close your blank tank valve, fill the black tank roughly half full, open the blank tank valve and let the hose run for 5-10 minutes until clear.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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