Originally Posted by Kris10May
We are pretty close to taking the plunge and going permanent this summer. I'm assuming all the same rules apply to black water tanks going into our 110 gallon holding tank. You still must treat the water in the black tanks and let the camper holding tank fill before emptying into the external tank. Right??
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We've been using the Geo Method (Google or Bing it if you've never heard of it) in our black tank for years with good results. Be aware that some campgrounds don't allow formaldehyde tank treatments. Yup, let the black tank fill, dump it first, then the grey tank(s) to flush the hose.