Sulphate Attack (TN3)

PWTAG Technical notes are updates or new material for the standards and guidance given in the PWTAG book, Swimming Pool Water and the PWTAG Code of practice and should be read in association with these publications.

An increasing number of reports have been received about problems being experienced in swimming pools due to the use of sulphate-based chemicals.

In most cases the initial effects observed are some erosion of the cement grout with a white suspension forming in the pool water when the grout surface is agitated. In one case a hotel pool had a water supply with just over 6mg/l sulphate with balanced pool water but the use of sodium bisulphate (dry acid) and alum (sulphate-based salt) had raised the sulphate level to 1,582mg/l with erosion of the grouted joints quite evident.


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