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Testomat Reagents 302, 303, 305, 310 (F-BOB/808)

Testomat Reagents 302, 303, 305, 310 (F-BOB/808)

Aquacover

£119

Testomat reagents/indicators are specific liquid used in Testomat water hardness/residue hardness monitoring systems used to detect when the residual (remaining) hardness of water exceeds a certain threshold (i.e. to produce a colour change or signal when hardness is above a preset limit).

Aquacover's own words, read from their page.

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Where this comes from

The part other shops don't tell you. Three separate questions, kept separate on purpose, each with its source.