Caro Flow Brochures Please see below the Caro Flow brochures. Caro Flow Roof Drainage With over 35 years experience of supplying and designing Roof and Floor Drainage products, Caroflow has the range of products to fulfil your needs. Caro Flow Floor Drainage With over 35 years experience of supplying and designing Roof and Floor Drainage products, Caroflow has the range of products to fulfil your needs.