Nothing will remove the buildup because that is mostly the housing of the unit distorting over time with the chlorine inside. Puck quality has a bigger effect on water chemistry than the chlorinator itself though cheap imported pucks are likely to stain the inside of the chlorinator just like they often do to the pool. A new inline chlorinator is about $90 so I would assume it is better to buy a new one than to try and repair a worn out 20 year old one...just my opinion.
John
Testimonial: "Thanks John. I did not know the chlorinator was self destructing. Ed"
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