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Water Hardener 4kg
Pool Wise
$20.95
Increases calcium hardness levels in swimming pools
Ideal Calcium Hardness level is between 200 - 500 ppm
View the PDF for more info:
https://www.mypoolclean.nz/site_files/35407/upload_files/SDS-Water-Hardner-1-1648598520.pdf?dl=1