estaban filtrando
-they/you were filtering
Imperfect progressiveellos/ellas/ustedesconjugation offiltrar.

filtrar

Me podrían hacer diálisis, que básicamente saca la sangre del cuerpo, la filtra y la regresa al cuerpo, porque los riñones no la estaban filtrando, y casi me hacen eso.
They could put you on dialysis—where they basically take your blood out and filter it and put it back into your body, because your kidneys are supposed to do that but they're not functioning—and they almost did that with me.
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