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PCE
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CPC Subgroup
C02F 5/04

using phosphates (C02F5/06 takes precedence)

Full Title

Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents (softening using ion-exchange C02F1/42) > Softening water by precipitation of the hardness > using phosphates (C02F5/06 takes precedence)