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Do you need floor beams and ring beams for a new three-meter-high toilet? There should be a shortage of food and a cool floor, and your toilet needs to be strong, so you need both a floor beam and a ring beam.
This depends on the expensive or cheap decoration and material selection in you, which will lead to a big difference, you can find a professional manufacturing team to ask.
Generally, one bag (500g) can purify 8 12 square meters, and the effect is better when used in sufficient amount!
The things you give are too simple, it depends on how big the pit is, what kind of roof is, whether the brick wall is plastered or not, ......There is a saying: "If you build a building, you can't build a thatched house".
It depends on what kind of construction is built, or find a master mason to estimate the price.
It is better to have 2 separate doors, so that it looks clean and hygienic.