Note from Freegle volunteers - Members wishing to ask for this should be aware that it is well beyond its best before date but a quick check on Google seems to indicate that if it looks and smells OK, then it should be alright to use, but it won’t be so effective.
However it is definitely recommended that no-one should swim in a pool for at least 48 hours after such chemicals are used.

A chemical additive put into a swimming pool to clear the water by removing small particulates in suspension. Purchased in France, so none of the instructions are in English. Purchased in error, our pool has a cartridge filter not a sand balloon, and the filter will clog completely if we use flocculant. Will not work with Bestway or Intex above ground pools. Not suitable for potable water systems. Purchased about 3 years ago and best before date was 3/1/2024. There are about 4.75 litres left in a 5-litre container. This is not the same as clarifier. Might be of use to somebody with a pool with a conventional filtration system in the UK who knows how to use a flocculant.

Flocculant (TN25)