cue chalk
A light acid wash should remove the chalk.
Leather is used for the cue tip, and pool chalk is used to provide more friction against the cue ball. Pool chalk is an abrasive using materials found in sandpaper. It is not a form of chalk.
On a typical bar box table such as a Valley there is a clean-out door located at the end of the table but a key is needed to open it. If you can't reach the chalk you'll need to remove the 6 rails and the slate which then allows access to the inside of the table.
It is called chalking the cue. The pool chalk is an abrasive, not chalk, and provides more frictin between the cue ball and the cue tip.
Pool chalk serves multiple purposes. The chalk allows the tip to become softer, so there is less chance of breaking the tip, and the most important thing chalk does is put English on your cue ball. If your not very good at pool and you go to the YMCA to play, you really don't need chalk, but to be good you need chalk to be able to put English on your ball to make easier shots.
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The sport of pool or pocket billiards uses chalk and pockets.
When a pool turns green, the cause is the build up of algae. To remove the algae, chemicals will need to be bought to restore the PH levels in the pool, killing the algae.
I am not sure why this has not been answered. The most common reason for the green is algae growth. If you put on a solar cover and ignore pool maintenance, then the algae will grow as the water heats and when you remove the cover, the pool will be green
a pool stick, pool balls with numers on them, chalker to chalk the top
Did you test for and remove ortho phosphates?