(introduction...)

HYPOCHLORITE SOLUTIONS

Sodium hypochlorite is a solution (liquid bleach) which only requires dilution to an appropriate concentration (2% available chlorine).

Calcium hypochlorite preparations contain some inert materials and it is important after mixing the chlorine solution it is allowed to settle and the clear solution is decanted off for use.

CONSTANT-HEAD CHLORINATORS

1. The constant head aspirator has a right angled capillary outlet and a centre tube air inlet. The flow rate is altered by rotating the capillary between the horizontal and vertical positions.

2. Constant head device for drip feed chlorination consisting of a floating bowl in a hypochlorite solution. Flow of chlorine is controlled by the position of the top of the regulating tube relative to the surface of the hypochlorite solution.