El filtro de pelusa está limpio.

Because filtro is a masculine noun in Spanish, so it takes the masculine singular article el.

• el filtro = the filter
• la is only used with feminine singular nouns

In Spanish, noun gender is grammatical, so you have to learn filtro as masculine.

De often means of, but in Spanish it is also commonly used to connect two nouns, where English might use a noun + noun structure.

So:

• filtro de pelusa = literally filter of lint
• natural English: lint filter

This is very common in Spanish:

• taza de café = coffee cup
• jugo de naranja = orange juice
• máquina de lavar = washing machine

Pelusa usually means lint, fluff, or fuzz.

In this sentence, it refers to the soft fibers that collect in a dryer filter, so lint is the best translation.

Depending on context, pelusa can also refer to:

• fuzz on fabric
• fluff from clothing
• fine hair or soft fuzz on a surface

Because Spanish usually uses estar for a condition or state that can change, and ser for more permanent characteristics or identity.

Here, being clean is a temporary condition:

• está limpio = it is clean
• later it could be dirty, so estar fits

Compare:

• La ventana está limpia. = The window is clean.
• El vidrio es transparente. = Glass is transparent.

Cleanliness is treated as a state, not an essential trait.

Because limpio agrees in gender and number with filtro, which is masculine singular.

Agreement in Spanish means adjectives change form to match the noun:

• el filtro está limpio = masculine singular
• la camisa está limpia = feminine singular
• los filtros están limpios = masculine plural
• las toallas están limpias = feminine plural

So limpio matches filtro.

Normally, no. In standard Spanish, you usually need the definite article here:

• El filtro de pelusa está limpio.

Leaving out el would sound unnatural in most normal contexts.

Spanish uses articles more often than English does. Even when English might say Lint filter is clean in a note or label, Spanish usually still prefers El filtro de pelusa está limpio in a full sentence.

Yes, it is understandable and natural. It is a clear, standard way to say lint filter.

Depending on the country or appliance manual, you might also see slightly different wording, such as:

• filtro de pelusas
• filtro atrapapelusas
• filtro para pelusa

But filtro de pelusa is perfectly good and easy to understand across Latin America.

In this sentence, limpio is not directly inside the noun phrase. It comes after está, so it is a predicate adjective:

• El filtro de pelusa = the subject
• está = is
• limpio = clean

So this is not really a case of adjective placement like un filtro limpio. It is the normal structure:

• subject + verb + adjective

Spanish often places descriptive adjectives after nouns when they are directly attached, but here limpio is part of está limpio, meaning is clean.

Yes, you could, but it sounds more formal or technical.

• El filtro de pelusa está limpio. = normal, everyday Spanish
• El filtro de pelusa se encuentra limpio. = more formal, more like instructions or technical writing

For regular conversation, está limpio is the most natural choice.

Está has a written accent to show that the stress falls on the last syllable: es-TÁ.

Without the accent, esta is a different word:

• esta = this, feminine
• está = is

So the accent mark is important because it distinguishes two different words.

A simple pronunciation guide:

• El ≈ ell
• filtro ≈ FEEL-troh
• de ≈ deh
• pelusa ≈ peh-LOO-sah
• está ≈ es-TAH
• limpio ≈ LEEM-pyoh

Yes. In real-life usage, el filtro de pelusa will often refer to the lint filter in a clothes dryer.

If the context is household appliances, that is probably what listeners will understand. Spanish often relies on context, just like English does.

If you wanted to make it extra explicit, you could say:

• El filtro de pelusa de la secadora está limpio.
  = The dryer's lint filter is clean.

The plural would be:

• Los filtros de pelusa están limpios.

Changes:

• el → los
• filtro → filtros
• está → están
• limpio → limpios

Everything that needs to agree in number changes accordingly.