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Aliexpress
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Latest price update (UTC time):
filter medium and cover can prevent the growth of bacteria, The filter medium can use 6 weeks
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi VIOMI Filter Box for Electric Kettle.
Price records source(s): Gearbest
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You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).