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Different functions of different water purifiers?

What is a pre-filter?
Pre-filter is also called waterway protector
Main use: Installed behind the water meter to filter sediment, rust and large particles in tap water, prevent a large number of precipitated impurities in the water network from causing harm to the human body, and play a pre-protection role for household appliances that use water.
Advantages: No need for special after-sales service, no need to replace the filter element, intuitive and transparent filtering effect (you can clearly observe the filtering effect and use status), long service life (up to several decades).
Insufficient: only coarse filter.
Usage: After connecting to the main water pipe, regularly observe the dirt deposition in the lower part. When there is a lot of dirt, open the valve at the lower part to automatically flush out the dirt.

P3 UV Sterilizer ALKALINE Filter POU Bottleless Desktop Water Dispenser with Touch Screen
What is an ultrafilter?
Main use: Effectively filter out harmful substances such as sediment, rust, bacteria, colloids, macromolecular organic matter in water, and retain minerals and trace elements that are beneficial to the human body.
Advantages: Completely remove bacteria and algae including some viruses, it can be safely consumed in places with low metal ion content (but direct drinking is not recommended).
Disadvantages: It cannot filter out calcium and magnesium ions and heavy metals, and there should be scale.
Usage: Replace the filter element regularly, and the replacement cycle of different filter elements is slightly different.