With a mop or a vacuum cleaner?
No as they will track footprints really, really bad. This is because dirt is not black, it is brown.
The tiles do not have to be black, they just make it to be black.
48 tiles * 3/4 144/4 = 36 black tiles ==========
Grout.
normal
To lay pool tiles, you will need mortar to affix the tiles to the cement pool, you will also need grout for between the tiles and a sponge to clean the tiles.
If they are ceramic tiles and this is the adhesive used to bond them, instructions will be on the container.
there is a special cleaner at lowes in the cleaner isle.
Use Tilex, it's amazing.
Acetic acid (vinegar)
One recommended way to clean the tiles in showers is to use "Jomax Mold and Mildew Stain Remover." This specific brand is great for weekly use around the bath and shower.
Glass tiles are surprisingly tough, at least as impact resistant as many ceramic tiles. They are easy to clean, but the most common reason for using glass tiles in a design is the wide range of vibrant colors. On the downside, they are generally smaller, which means more grout lines, which can be difficult to clean.