Descalcificamos la cafetera espresso.

Descalcificamos is the 1st person plural form of descalcificar.

With a regular -ar verb, this form can mean either:

• we descale / we are descaling (present)
• we descaled (preterite / simple past)

So, by itself, the sentence is ambiguous. Context tells you which meaning is intended:

• Cada mes descalcificamos la cafetera espresso. = We descale the espresso machine every month.
• Ayer descalcificamos la cafetera espresso. = Yesterday we descaled the espresso machine.

Spanish often omits subject pronouns because the verb ending already tells you who the subject is.

• descalcificamos already means we

So Descalcificamos la cafetera espresso is completely natural without nosotros.

You could add nosotros for emphasis or contrast:

• Nosotros descalcificamos la cafetera espresso, no ellos.

Because cafetera is a feminine singular noun, so it takes the feminine singular article la.

• la cafetera = the coffee machine / coffee maker

The article has to agree with the noun in gender and number.

The personal a is mainly used before specific people (and sometimes pets or personified beings) when they are direct objects.

Here, la cafetera espresso is a thing, not a person, so there is no personal a.

• Vemos a María. = person → uses a
• Descalcificamos la cafetera. = thing → no a

It is understandable, but in Spain many speakers would more naturally say:

• cafetera exprés
• máquina de espresso
• sometimes simply cafetera, if the type is already clear

Espresso is widely understood, especially in product descriptions, packaging, or more international contexts. But exprés is the more adapted Spanish form you will often see in Spain.

Here espresso works as a specifier/modifier telling you what kind of coffee machine it is.

In Spanish, nouns are often modified by another noun without needing to change form:

• cafetera espresso
• camisa sport
• software empresarial (different structure, but similar idea of specification)

Also, espresso does not change to agree in gender or number here. So you could say:

• la cafetera espresso
• las cafeteras espresso

Yes. This sentence has a very normal Spanish order:

• Verb + direct object

So:

• Descalcificamos la cafetera espresso.

is a neutral, standard way to say it.

Other orders are possible for emphasis, but they are less neutral:

• La cafetera espresso la descalcificamos nosotros.

That version emphasizes the espresso machine or we.

In standard Spain Spanish, it is roughly:

des-kal-thee-fee-KAH-mos

A few pronunciation notes:

• c before a sounds like k
• ci in Spain usually sounds like th in think
• the stress falls on ca: descalcifiCAmos

If you use a Latin American pronunciation, ci would usually sound like s instead of th.

Not by itself in standard grammar. Descalcificamos la cafetera espresso is normally read as a statement, not a command.

If you want Let’s descale the espresso machine, Spanish would usually say:

• Descalcifiquemos la cafetera espresso.
• Vamos a descalcificar la cafetera espresso.

So the original sentence is declarative, not an imperative.

Yes, descalcificar is a normal verb meaning to descale or remove limescale from something.

It can be used for coffee machines, kettles, pipes, washing machines, and other appliances where mineral buildup is a problem.

Examples:

• Hay que descalcificar la cafetera.
• Tenemos que descalcificar el hervidor.

So it is not limited to coffee machines.