What
causes the "ring" around my pool's tile line?
The
accumulation of oils and dirt from bathers is the biggest cause.
Using a tile cleaner specifically designed for pools can clean
it off. Household cleaners do not contain the needed balance of
both oil/grease cutters and scale dissolving ingredients. In fact,
these cleaners can actually dull a tile line due to abrasives
or cause unsightly foaming. Even worse, they may react with the
sanitizer, such as chlorine, in your pool.
The
accumulation of oils and dirt from bathers is the biggest cause.
Using a tile cleaner specifically designed for pools can clean
it off. Household cleaners do not contain the needed balance of
both oil/grease cutters and scale dissolving ingredients. In fact,
these cleaners can actually dull a tile line due to abrasives
or cause unsightly foaming. Even worse, they may react with the
sanitizer, such as chlorine, in your pool. 
