PART 12
MINERAL SULPHATES
23. Mineral Sulphates
Where the Sewerage Authority is satisfied that any concrete or mortar used on drainage works is liable to encounter any water containing calcium sulphate, magnesium sulphate or sodium sulphate equivalent in concentration to 100 parts or more of sulphur tri-oxide per 100,000 or to encounter a clay containing 1/5 or more of 1%, of its dry state of such sulphates then the Sewerage Authority may require the use of high alumina cement in all cases where cement is employed on such drainage works.