Can I use it in a baby bath, a sink and a full-sized bath?Updated a month ago

Yes. The tablet works in any body of water, a baby bath, a kitchen sink, or a full-sized bath. Just adjust the dosage as per these instructions:

Dissolve tablet fully in bathwater before bathing (takes around 60 seconds) to help purify bath water, following the recommended dosage:

Newborns Up to 2 litres of water: Use ¼ tablet per bath.

Small children Under 7 years old, ¼ to ½ full bath: Use ½ tablet per bath.

Adults / larger baths Use 1 full tablet for a medium - large sized bath.