algae United Kingdom

...-Seal Block Paving Sealer and Concrete Sealers have many uses. They reduce the wear of the concrete, prevent water ingress into the surface, stop the loss of the colour on the surface of imprinted concrete and stop the growth of algae and weeds in the joints of block paving or patio slabs. Swiss-Seal sealers protect wet concrete and block paving against frost thus stopping eventual surface flaking of...

... stops water from entering the surface and stops the loss of the colour on the imprinted concrete. Wear and tear will be to the concrete sealer and not the concrete colour. The sealer will inhibit the growth of algae moss and weeds in block paving.