Verbseoul.
하다 verb
여과하다yeogwahadato filter, to percolate

To say to filter, to percolate politely in the present tense, use 여과해요 (yuh-gwah-hae-yoh). Below is the full conjugation of 여과하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
여과해
yuh-gwah-hae
여과해요
yuh-gwah-hae-yoh
여과합니다
yuh-gwah-hahm-nee-dah
Past
여과했어
yuh-gwah-hae-ssuh
여과했어요
yuh-gwah-hae-ssuh-yoh
여과했습니다
yuh-gwah-hae-sseum-nee-dah
Future
여과할 거야
yuh-gwah-hahl- -guh-yah
여과할 거예요
yuh-gwah-hahl- -guh-yae-yoh
여과할 겁니다
yuh-gwah-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
여과하세요
yuh-gwah-hah-sae-yoh
Suggestion / Let's Polite (요)
여과해요
yuh-gwah-hae-yoh
Question Polite (요)
여과해요?
yuh-gwah-hae-yoh-?
Connective “and” — (고)
여과하고
yuh-gwah-hah-goh
Conditional “if” — (면)
여과하면
yuh-gwah-hah-myuhn
Noun form — (기)
여과함
yuh-gwah-hahm