Re: rear holding tank clogged

Craig Briggs


I may have been the one you recall being an advocate of Hydrochloric acid - also known as Muriatic acid. All your plumbing parts will be non-reactive with it (remember, much waste going in is acidic). Depending on the amount of build-up in your pipes you may have to let it "cook" for a long time and repeat to get them really clean. Then every few weeks should keep things clear. No need for the extra chemical reaction excitement of adding a base like baking soda to the acid - the deposits you're attacking are already doing that so just flush everything through. Hydrochloric acid totally dissociates in water. Of course, do be eco friendly with your discharge.

It's sold in many countries as toilet cleaner, but read the label to be sure it's Hydrochloric acid and not caustic soda and never mix those - way too exciting. Some brands also contain surfactants that add to the effectiveness, but plain HCl is excellent and cheap.

Craig Briggs

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