I agree on 2 tanks. We don't chemical our grey tank, just the black. If we had a bigger tank for all, it would take more chemicals to keep it odor free. That stuff costs enough as it is, I don't want to buy more. I, too, don't want sewer in the shower.
Kay
I don't bother using chemicals at all any more. Try the Geo Method I dropped the chemical use many years ago.
Aaron
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....so many Airstreams....so little time...
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