It is required to flush the fire …

It is required to flush the fire water supply in the 11th floor office building. Washing must be done with 5-10% oxalic acid (purchased). Washing volume: Building: 500 m - Ø159 300 m - Ø32 500 m - Ø25 100 m - Ø57 Parking: 250 m - Ø159 400 m - Ø25 400 m - Ø32 100 m - Ø76 Connection via the shut-off valve Ø32 - 57. The floor is washed with 20 m3 of oxalic acid 5-10%. Next, drain and rinse with water of the same volume. The spent acid must be disposed of, but not on the site. I will consider proposals for the Central Federal District. Moscow, Yuzhnoye Chertanovo