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Chewing gum: Chewing gum never dissolves in water and, worse yet, it can adhere to other flushables to form a clog

Heterogeneity and bias The heterogeneity seen in some meta-analyses is largely due to statistically significant relative risk estimates that differ from each other, and several reasons for this may exist (for example, with or without adjustment for multiple confounders)

Here is are the specs (PDF) Here is a where you can buy it Based on that I would say it's replaceable, with some soldering required

This sub-segment remains central to consumer spending as users regularly purchase refills to maintain usage levels