This is the 7749th most frequent Spanish word.
lts
It seems "lts" is not a standard Spanish word. Could it be a typo or abbreviation?
Here 'lts' is used as an abbreviation for 'liters', a unit of measurement for volume.
La cantidad total que necesitamos es de 5 lts.
The total amount we need is 5 liters.
In this sentence, 'lts' represents 'liters', indicating the volume of paint used.
Los lts de pintura fueron suficientes para cubrir toda la pared.
The liters of paint were enough to cover the whole wall.
This instance shows 'lts' as shorthand for 'liters', which measures the volume of the purchased water.