Metemos el aditivo en el compartimento del suavizante.

Metemos is the 1st person plural present of meter: we put in / we insert.

In this context, meter suggests putting something into a space or compartment, so it feels a bit more specific than the very general English verb put.

So:

• meter = to put in, insert
• metemos = we put in / we insert

In laundry instructions, this makes sense because you are placing the additive into a specific drawer section.

Spanish often uses the present tense, especially 1st person plural (we), to give instructions in a friendly or inclusive way.

So Metemos el aditivo... can function like:

• We put the additive...
• meaning Let’s put the additive...
• or simply an instructional Put the additive...

This is very common in spoken explanations, tutorials, and step-by-step guidance.

Other possible styles would be:

• Mete el aditivo... = Put the additive... (tú, informal singular)
• Meta el aditivo... = Put the additive... (usted, formal singular)
• Meted el aditivo... = Put the additive... (vosotros, informal plural, common in Spain)
• Metan el aditivo... = Put the additive... (ustedes, plural)

So metemos is not wrong at all; it just gives the instruction in a softer, more inclusive way.

In Spanish, subject pronouns are often omitted because the verb ending already tells you who the subject is.

Here, metemos already clearly means we put in, so nosotros is unnecessary.

• Metemos el aditivo... = normal, natural
• Nosotros metemos el aditivo... = possible, but usually only used for emphasis or contrast

For example:

• Nosotros metemos el aditivo, pero ellos no.
  We put in the additive, but they don’t.

In a simple instruction, leaving out nosotros is the normal choice.

Spanish uses articles more often than English does.

Here, el aditivo means the additive, referring to a specific additive that is already understood from the context.

In instructions, Spanish often uses the definite article when the object is known or expected:

• Metemos el aditivo... = We put in the additive
• Cerramos la puerta. = We close the door
• Pulsamos el botón. = We press the button

If you said un aditivo, it would sound more like an additive / some additive, as if introducing it for the first time or speaking less specifically.

Del is the contraction of:

• de + el = del

So:

• el compartimento del suavizante literally = the compartment of the softener

In natural English, that becomes:

• the fabric softener compartment
• or the compartment for the softener

This contraction is mandatory with de + el:

• de el ❌
• del ✅

The only common exception is when El is part of a proper name, such as de El Escorial.

Both are possible, but they are slightly different in feel.

• el compartimento del suavizante = the softener compartment
  This is the most natural label-like expression. It identifies the compartment by its function or association.

• el compartimento para el suavizante = the compartment for the softener
  Also correct, but a bit more explicit.

Spanish often prefers the noun + de + noun structure where English uses an adjective or compound noun:

• compartimento del suavizante
• cajón del detergente
• botón de encendido

So this structure is very normal.

In Spain, suavizante is the normal word for fabric softener.

In laundry vocabulary:

• detergente = detergent
• suavizante = fabric softener

Suavizador exists as a word in Spanish, but for laundry products, suavizante is the usual term.

So:

• el compartimento del suavizante = the fabric softener compartment

This is exactly the kind of wording you would expect on packaging or in washing-machine instructions in Spain.

En means in / inside / into in this kind of context.

Because the additive is being placed inside a compartment, en is the natural choice:

• Metemos el aditivo en el compartimento... = We put the additive in the compartment

English sometimes uses into, and Spanish can sometimes imply that same idea with en.

You would not normally say a el compartimento here. With containers, drawers, compartments, boxes, etc., en is what you usually want.

Examples:

• Ponlo en la caja. = Put it in the box.
• Echa agua en el vaso. = Pour water into the glass.
• Mete la ropa en la lavadora. = Put the clothes in the washing machine.

Yes, you could, but the nuance changes a little.

• metemos = we put in / insert
  Emphasizes putting something into a space

• ponemos = we put / place
  More general

• echamos = we pour / add / put in
  Very common for liquids, powders, detergent, etc.

In a laundry context, all of these may be possible depending on the product:

• Metemos el aditivo...
• Ponemos el aditivo...
• Echamos el aditivo...

If the additive is a liquid or powder, echamos is especially common.
If the focus is on placing it into a specific drawer section, metemos works well.

The given order is the most neutral and natural:

• Metemos el aditivo en el compartimento del suavizante.

But Spanish word order is fairly flexible if you want emphasis.

For example:

• El aditivo lo metemos en el compartimento del suavizante.
  As for the additive, we put it in the softener compartment.

• En el compartimento del suavizante metemos el aditivo.
  It’s in the softener compartment that we put the additive.

These alternatives are grammatical, but the original version is the best straightforward instructional sentence.

Metemos is:

• verb: meter
• tense: present indicative
• person: 1st person plural
• subject: we

Full present tense of meter:

• meto = I put in
• metes = you put in
• mete = he/she/you(formal) puts in
• metemos = we put in
• metéis = you all put in (vosotros, Spain)
• meten = they/you all put in

Even though it is grammatically a present tense form, in instructions it often functions like an imperative or guided step.

Yes, it sounds very natural in Spain.

Two particularly Spain-friendly features are:

• suavizante for fabric softener
• using metemos as an instructional we do this now

A speaker from another Spanish-speaking country would still understand it perfectly. The sentence is standard Spanish, not something uniquely Spanish-only. But the overall tone and vocabulary fit Spain very well, especially in everyday household instructions.