Can the manure be used to irrigate the land after brushing the toilet with hydrochloric acid?

The effect is super good, it will not corrode the glaze of the tile, but because it is extremely corrosive, it is best not to get it on the body, just simply remove the rust with toilet cleaner or 84 brush, they are slightly safer to use.

It is sold at grocery stores or chemical stores.

Yes, use dilute, because some things are insoluble in water, but can react with hydrochloric acid to form substances that can be soluble in water.

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Sulfuric acid and hydrochloric acid are not suitable for flux, depending on what you want to weld, generally speaking, rosin is the best flux, but if you want to weld ironware, such as enamel basins and other things can use solder paste, of course, you can use diluted hydrochloric acid to remove rust, and the welding effect will be better.