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My trailer has a warning to not close the tank valve while running the black tank flush. I know some of you said you close it up to let the water build up, which I've considered doing. I guess I figured if you closed it then water could potentially come out of the toilet and thats why they warn against it.
It seems a few of you have had no issues while running the tank flush hose while the valve is closed. I'll have to give it a shot. I love when everything is fully empty and as clean as possible.
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