I did one recently as part of a blood spill job. A lad had kicked a football which hit a window, glass hit a girl causing the blood spill and also went into the pool. They drained the pool which was 20m x 10m, tiled. I cleaned the blood with 429,vacuumed the pool (BS36) to remove the glass, then hot washed it with the fsc. £580 - took a day