German Phrase
Der Klimafilter ist dreckig.
Meaning
The sentence states that the climate filter is dirty. It can refer literally to a physical filter in an HVAC system or metaphorically to a system meant to ‘clean’ climate data or policies that has become compromised.
When to use
Use this phrase when you notice a filter in a climate‑control device needs cleaning, or when you want to comment that a metaphorical ‘filter’ (e.g., a policy or algorithm) is no longer pure or effective.
✦Grammar Breakdown
DerKlimafilteristdreckig
Definite Article (Der)
‘Der’ is the masculine nominative singular definite article, used here because ‘Klimafilter’ is a masculine noun.
Noun Gender (Klimafilter)
‘Klimafilter’ is a masculine compound noun (Klim(a)- + Filter) meaning ‘climate filter’; compounds inherit the gender of the head noun, here ‘Filter’ (masculine).
Verb ‘sein’ (ist)
‘ist’ is the third‑person singular present of ‘sein’ (to be), used for describing a state or condition.
Adjective Predicate (dreckig)
When an adjective follows ‘sein’, it is used predicatively and does not take an ending; ‘dreckig’ means ‘dirty’.
🗨In Conversation
Der Klimafilter ist dreckig.
The climate filter is dirty.
Dann sollten wir ihn sofort reinigen, sonst wird die Luftqualität schlechter.
Then we should clean it right away, otherwise the air quality will get worse.
✕Common Mistakes
Der Klimafilter ist dreckig.
In formal technical writing you would usually use ‘verschmutzt’ or ‘schmutzig’ instead of the colloquial ‘dreckig’.
Das Klimafilter ist dreckig.
If you mistakenly treat ‘Klimafilter’ as neuter, you might write ‘Das Klimafilter…’, which is incorrect because the noun is masculine.
Der Klimafilter sind dreckig.
Using ‘sind’ would be wrong because the subject is singular.
↔Alternatives
Der Klimafilter muss gereinigt werden.
The climate filter needs to be cleaned.
Der Klimafilter ist verschmutzt.
The climate filter is polluted.
Der Klimafilter ist schmutzig.
The climate filter is filthy.
Cultural Tip
In German technical contexts, it’s common to use the verb ‘reinigen’ (to clean) rather than just stating something is ‘dreckig’. Saying a filter is ‘dreckig’ can sound informal; in a professional setting you might say ‘Der Filter ist stark verschmutzt’ or ‘Der Filter muss ausgetauscht werden’. Also, note that ‘Klimafilter’ is a newer compound, so native speakers may prefer ‘Klimaanlagen‑Filter’ for HVAC systems.