Playing area Uniform dimensions are illustrated. The minimum depth for major competitions is 1.80m. All lines must be visible throughout the game. Suggested colors are: goal line and half distance line – white; 2m line – red; 4m line – yellow. There must be sufficient room for the referees to walk along the edge of the pool. Goals must be painted white and fixed firmly
DRESS: Players wear suits/trunks. One team must wear blue caps, and the other white. Goalkeepers wear red caps. All caps must be tied under the chin. If a player loses his cap, he must replace it at the next stoppage. Caps are numbered on the sides -- the goalkeeper being #1 and the other players 2-13. No dangerous articles may be worn. No player may grease or oil his body.
TEAMS: A team comprises 13 players of whom six are substitutes.
SUBSTITUTES: Except in case of injury or accident, a substitute may only enter the game:
a. during the interval after a goal
b. before extra time
c. after a teammate has been excluded from the rest of the game
for showing disrespect, wearing oil or committing a third
The team captain must inform a referee of all substitutions. No substitutes are allowed in cases of brutality.
DURATION: Play lasts for four periods of seven minutes' actual playing time. There is a two minute interval between each period for changing ends.
Players in the water may only leave at an interval when injured or with the referee's permission.
For and accident or injury the referee may suspend play for up to three minutes.
If there is a tie and a definite result is required, there is a five-minute break, then two periods of three minutes' play with one-minute interval between. This pattern is continued until a decision is reached.
START OF PLAY:
Players take up position on their own goal lines about 1 m apart form either goal post (only tow players are allowed between the posts).
One the referee then blows the whistle and throws the ball into the pool.
RESTARTING PLAY: a) After a goal, players take up any position in their own half. The team conceding the goal restarts play, when one referee whistles, by one player passing the ball to a teammate, who must be behind the half distance when he receives the ball.
b) After a stoppage for injury, etc. or after a simultaneous foul by the opponents, one referee throws the ball into the water giving both teams equal chance of gaining possession.
PLAYING THE BALL: Apart from the goalkeeper players are NOT permitted to: a) touch the ball with both hands simultaneously; b) strike the ball with a clenched fist.
They are permitted to: (1) dribble with the ball; (2) seize the ball; (3) lift the ball out of the water; (4) remain stationary with the ball; (5) pass or shoot the ball; and play the ball when it is in the air.
A team must concede a free throw, if it fails to shoot at the goal within 35sec. of gaining possession of the ball.