Ворсовый фильтр чистый.

In Russian, the verb to be is usually omitted in the present tense.

So:

• Ворсовый фильтр чистый. = The lint filter is clean.

But in the past or future, Russian does use forms of to be:

• Ворсовый фильтр был чистый. = The lint filter was clean.
• Ворсовый фильтр будет чистый. = The lint filter will be clean.

So the missing is is completely normal.

Because both are adjectives agreeing with фильтр.

Фильтр is:

• masculine
• singular
• nominative

So the adjectives that go with it also appear in the masculine singular nominative form:

• ворсовый = masculine singular nominative
• чистый = masculine singular nominative

This kind of agreement is very important in Russian. English adjectives do not change, but Russian adjectives do.

All three words are in the nominative here.

• фильтр is the subject
• ворсовый agrees with фильтр
• чистый is a predicate adjective describing the subject

So structurally, the sentence is basically:

• [ворсовый фильтр] = the lint filter
• [чистый] = clean

That is why nominative makes sense here.

Because the two adjectives are doing different jobs.

• ворсовый is an attributive adjective: it directly describes what kind of filter it is, so it goes with the noun phrase:
  ворсовый фильтр = lint filter

• чистый is a predicate adjective: it gives the main statement about the filter:
  фильтр чистый = the filter is clean

So the sentence means:

• [ворсовый фильтр] [чистый]
• The lint filter [is] clean

If you said чистый ворсовый фильтр, that would normally mean a clean lint filter, not a full sentence.

Ворсовый comes from ворс, which refers to lint, fuzz, fibers, pile, nap depending on context.

So ворсовый фильтр is most naturally translated as:

• lint filter

In a different context, ворсовый could refer more literally to something fibrous, fuzzy, or with a pile/nap. But in appliance language, lint filter is usually the best natural translation.

Yes, you could.

Russian has both:

• the full form adjective: чистый
• the short form adjective: чист

So both are possible:

• Ворсовый фильтр чистый.
• Ворсовый фильтр чист.

The difference is mostly stylistic:

• чистый sounds very common and neutral
• чист can sound a bit more concise, formal, or literary

In everyday Russian, the full form is often very common in sentences like this.

Russian has no articles, so the sentence itself does not explicitly say the or a.

That means:

• Ворсовый фильтр чистый could mean The lint filter is clean
• or, in a different context, A lint filter is clean

In real life, context usually makes it clear. If you are talking about a specific machine or a specific filter, English would usually translate it as the lint filter.

Yes, Russian word order is flexible, but changing it can change the emphasis.

For example:

• Ворсовый фильтр чистый. = neutral statement
• Фильтр чистый. = The filter is clean; natural if it is already clear which filter you mean
• Чистый ворсовый фильтр = usually a clean lint filter, a noun phrase rather than a full statement

So the original order is useful because it first names the object, then says something about it.

Yes, it is grammatical and natural, especially in a technical, instructional, or descriptive context.

It can sound like something from:

• a manual
• a checklist
• a maintenance instruction
• a status description

In everyday conversation, if everyone already knows which filter is being discussed, a Russian speaker might simply say:

• Фильтр чистый.

But the full sentence Ворсовый фильтр чистый is perfectly normal when you want to specify exactly which filter you mean.