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Good morning, well I have a small problem with my display on the automatic dosing system. The chlorine value shows 840 but is only set to 760. Unfortunately, the shake test does not show a chlorine value in the pool. where can the error lie? If I pour liquid chlorine directly into the pool, I get a purple indicator on the shake test.

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Hello

try to test your probe like this https://ph-redox-pool.com/de/content/17-ist-meine-redox-sonde-außer-betrieb