Scrabble is a game that is played by 2, 3 or 4 people. It uses a board with squares on it (15x15) and a large number of letters on small tiles. Each player, when it is his/her turn, has to put a word on the board, using any of the seven letters (seven tiles) that they have in front of them. Their word must join on to what is already on the board.
Install a water softener in your home. Hard water contains dissolved calcium, magnesium, lime and iron. Use water softener salts specially formulated to remove iron from water and prevent rust stains in bathtubs, sinks, toilet bowls and laundry. These water softener salts often go by the names of Rust Out, Red Out or Iron Fighter Pellets.
Try using rust remover products for these are proven effective against these stubborn stains. However, other acids in your pool may compete with your rust remover and what you have to do is to lower the acid concentration of your pool water (ask your pool technician how to do this) and let your product do its job. Take preventive measures in order to remove rust stains for good.