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Sewer odors
We have been using the low cost orange liquid toilet treatment from Wally World for about the past year now. It has worked pretty well until recently. We usually empty the black tank once a week or sometimes longer if we are going to be leaving a campground. Starting about a month and a half ago, after five days the bathroom fills with sewer odors every time we flush. After the odor returns the water in the bowl doesn't immediately drain when the foot pedal is depressed. Instead an air bubble forms then pops, spraying liquid within the bowl and occasionally outside. Without the odor the liquid drains as intended with no bubble. When we notice the odor we dump the black tank, until last time on 5 day intervals rather than seven. This past interval was only a three days until the odor returned.
When we dump we always use the black tank flush. This past dump it ran for a little over an hour. After dumping we have been using 4 oz. of the orange treatment followed by a gallon of water down the toilet from a jug. Our concern is that since the orange treatment has worked for almost a year, do we have another issue that might be generating the odor. We don't want to change treatment brands if something else is the cause.
Any thoughts?
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