I have a used 2013 5er the first 2 times out were for 4 days each, 1 full hookup and 1 not there was no odor from any of the tanks this time out full hookup for 7 days after 3 days the odor was very strong so I drained the black tank odor was gone for about 1 day so I opened the black tank and left it open still have an odor. I use the packs in the tank to deodorize and break down I even changed brands still didn't help. Could it be from the campgrounds water? Any help will be appreciated.
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