Answer:
filtering
Step-by-step explanation:
fil·ter
/ˈfiltər/
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verb
gerund or present participle: filtering
pass (a liquid, gas, light, or sound) through a device to remove unwanted material.
"the patient is hooked up to a dialysis machine twice a week to filter out the cholesterol in the blood"
synonyms: sieve, strain, sift, filtrate, riddle; More
process or assess (items) in order to reject those that are unwanted.
"you'll be put through to a secretary whose job it is to filter calls"
process or treat with a filter.