Why are the chlorine levels still high after my shower filter?

This depends upon how you measure the chlorine levels and if you have a high quality filter. To test whether a shower filter is working or not, you need to measure free chlorine level not total or combined chlorine levels. For this you need to use a common DPD test kit or similar not and OTO kit as these test combined chlorine.

Shower filters cause free chlorine to combine and become a harmless salt which affects the combined or total chlorine levels.

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