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In almost 5 years of owning our unit we have never had a problem with slow moving drains unless the gray tank was about full. I would think that it may be a problem related more towards a vent for the kitchen sink being restricted. That is as long as you haven't been pouring grease down the drain.
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2007 38Rl3 MS
2005 Chevy 3500 4x4 5" Exhaust, Edge Attitude Tuner, Airaid Intake, Air Bags, Rancho Shocks, Hellwig Big Wig Sway Bar
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