I think I will wait until I get home in a month. I'll try some food coloring in the shower and sink drains to see what happens. Maybe red in the toilet and just really fill it up. Maybe the first tank overflows into the second. Will also do the kitchen sink with green. I'll work it out though. Will let u know after I done it.
I need a few things done so will talk to the guys at the rv repair and see what they suggest.
Thanks
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