Filtraste comes from the verb filtrar, which means "to filter" or "to seep in". While it can refer to filtering liquids, in a metaphorical sense, it means to penetrate or subtly make one's way into something.
In this song, the lyric "Te filtraste hasta las venas" (You filtered/seeped into my veins) is a poetic and intense way to express how deeply the beloved has entered the singer's being. It conveys a sense of an irresistible and all-encompassing presence, making it a unique and memorable word choice for a love song.
Have you ever met someone who just completely changes your world, and you can't quite put your finger on why? That's exactly what Lucah is singing about in "Mi Vida Eres Tú" [My Life Is You]. He's totally captivated, saying, "Tienes algo que me llena / Tienes algo que me atrapa y que me parte en dos" [You have something that fills me / You have something that traps me and breaks me in two]. He's trying to figure out what it is about this person – maybe it's their "brillo en tu mirada, tu sonrisa que me abraza" [shine in your gaze, your smile that embraces me].
He admits, "Yo no se que hiciste tú a mi corazón / Pero a tu lado todo tiene otro color" [I don't know what you did to my heart / But by your side everything has another color]. This person has brought so much joy that he's even forgotten how to suffer, declaring, "Desde que estas aquí he olvidado sufrir" [Since you are here I have forgotten how to suffer]. It's a sweet, heartfelt song about finding that one person who makes everything better and wondering how you ever lived without them!