Use the right cleaning product for the job.
Swimfresh Spring Cleaner is an acid based cleaner used to remove calcium scale from concrete and stone surfaces.
Swimfresh Tile and Liner Cleaner is used to remove dirt and grime from the pool waterline.
Swimfresh Scale Off is used for cleaning and removing calcium build up from slatted covers and surrounding areas. It should not be applied to surfaces that are sensitive to acids.