Diluimos la solución descalcificante.

It comes from the infinitive diluir.

Here, diluimos is the first person plural form, so it matches we.

In the present tense, the conjugation is:

• yo diluyo
• tú diluyes
• él/ella diluye
• nosotros diluimos
• vosotros diluís (used in Spain)
• ellos/ellas diluyen

A useful pattern to notice: verbs in -uir often have a y in most forms, but not in nosotros and vosotros.

Because Spanish often drops subject pronouns when they are not needed.

The ending -imos already tells you the subject is nosotros (we), so Nosotros diluimos la solución descalcificante would be grammatical, but usually unnecessary.

This is very common in Spanish:

• Comemos = we eat / we are eating
• Vivimos = we live
• Diluimos = we dilute / we diluted, depending on context

Yes. Diluimos can be either:

• present tense: we dilute / we are diluting
• preterite: we diluted

This is a normal ambiguity in Spanish for many -ir verbs in the nosotros form.

So only the context tells you which one is meant.

For example:

• Ahora diluimos la solución... = present
• Ayer diluimos la solución... = preterite

In Spanish, instructions often use an instructional we: a first person plural form that sounds like we do this now or let’s do this step.

So diluimos can sound natural in procedural language, especially in explanations, demonstrations, recipes, lab steps, or manuals.

If you wanted a more direct command in Spain, you could also see:

• Diluid la solución descalcificante = command to vosotros
• Diluya la solución descalcificante = formal singular command
• Diluyan la solución descalcificante = formal/plural command
• Diluyamos la solución descalcificante = let’s dilute the descaling solution

So diluimos is not literally the imperative, but it can still be used in an instructional style.

La is the definite article, so it refers to a specific solution, one that is already known from the context.

That is very natural if:

• the solution has already been mentioned,
• it is the obvious product being used,
• or the speaker assumes everyone knows which solution is meant.

If you said una solución descalcificante, that would sound more like a descaling solution, introducing it for the first time or speaking more generally.

Because in Spanish, adjectives usually come after the noun.

So:

• solución descalcificante

matches a very common Spanish pattern:

• agua caliente
• producto químico
• café frío

English often puts the modifier before the noun, but Spanish usually puts it after.

So where English says something like descaling solution, Spanish naturally says solución descalcificante.

It is an adjective describing the type of solution.

It is built from:

• des- = undo, remove, reverse
• calc- / calcificar = related to lime/scale deposits
• -ante = a suffix often meaning doing or causing

So descalcificante is basically descaling or scale-removing.

In household context, it refers to something used to remove limescale.

Because adjectives ending in -e or many consonants often have the same form for masculine and feminine.

So you get:

• producto descalcificante
• solución descalcificante

The adjective stays the same.

Only the noun and article show the gender:

• el producto
• la solución

In the plural, it changes normally:

• productos descalcificantes
• soluciones descalcificantes

Because the stress falls on the last syllable: so-lu-CIÓN.

Words ending in n, s, or a vowel normally have stress on the second-to-last syllable unless there is a written accent.

So the accent in solución shows that the stress is not the default one.

Also, solución is a feminine noun:

• la solución
• una solución

Its plural is soluciones.

Yes, it is perfectly understandable in Spain, especially in technical, cleaning, or appliance-related contexts.

That said, in everyday product language you may also see:

• descalcificador
• antical

For example, on packaging or in household instructions, producto antical is also very common in Spain.

So solución descalcificante sounds correct and clear, but depending on the brand or context, other terms may be more common.

A rough Spain pronunciation would be:

• Diluimos → dee-LWEE-mos
• la solución → la so-loo-THYON
• descalcificante → des-kal-thee-fee-KAN-te

A few useful pronunciation notes:

• In most of Spain, c before i is pronounced like th in thin, so:

  • solución
  • descalcificante
• Diluimos is stressed on -lui-.
• solución is stressed on the last syllable.
• descalcificante is stressed on -can-.

If you use a Latin American pronunciation instead, the c before i would sound like s instead of th.