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If it's the kitchen sink, remove the P trap and clean & flush.
If it's the shower drain, remove the drain screen and pluck out stuff hung up on the plastic cross plug and flush.
If it's the bathroom sink, remove the plunger and clean of all the gunk collected on the plunger retaining rod and flush.
Have had to do all three over the last 4 years.
Do not use any chemicals, they could possibly damage your tank drain valve rubber seals and gaskets.
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