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i BUILDINGS § 6-193 casing. Such protective casing shall be set watertight into the well casing. The suction line ahall be caulked I into the protective casing to provide a watertight joint which will permit easy removal. The suction line shall slope upward toward the pump. Where a suction line is ~ brought into a basement from a well located some distance from the basement, the pump shall be located at least eighteen (18) inches above the basement floor. (f) Provisions shall be made in the well seal for future measurements of static and pumping levels. (Ord. No. 56, § 4-7, 9-12-60) Sec. 6-183. Chlorination. After final installation of the pumping equipment, the well shall be pumped continuously until the water is free of turbidity, then chlorinated heavily in accordance with the following procedure: (a) Introduce into the well one pound of high test (seventy (70) per cent or equivalent) calcium hypochlorite (chlorinated lime) by scattering same over the surface of the water in the well so that the powder will sink to the bottom, thereby permeating the supply. (b) If powder cannot be introduced directly, then mig one pound of calcium hypochlorite high test (seventy (70) per cent or equivalent) with five (5) gallons of water and pour the mixture into the well. (c) Allow the chemical to remain in the well for at least twelve (12) hours, then pump to waste until the odor and taste of the chemical have practically disap- peared. (d) Where calcium hypochlorite tablets meeting the above requirements are used, they shall remain in the well for a minimum period of forty-eight (48) hours before it is pumped to waste as deacribed above. ' (e) Wells larger than four (4) inches in diameter require proportionally larger doses of the chemical for I chlorination but shall not have a concentration of 345 I