INTRODUCTION
The control of bio-fouling and sanitizing water systems by chlorination has been proven to be the most effective method for water treatment. Hypochlorination from salty water provides an effective method of water treatment that is safe for personnel and the environment.



The generation of sodium hypochlorite (bleach) from on-site hypochlorite generators is the safe alternative to chlorine gas chlorination systems as the chlorine generated in the generator is locked up as sodium hypochlorite at concentrations below the threshold of hazardous materials (1%) mandated by the EPA.

Algae Build Up

Algae build up within seawater piping systems is caused by small pieces of vegetable matter lodging in pipe joints or cracks, or those areas where the flow is so low that any sticky material can cling to the walls of the pipes. Algae is also very susceptible to chlorine attack when it lodges in cracks or sticks to a surface. Therefore, low chlorine dosing can be very effective.

Operating Philosophy

Unlike bi-valves, if the chlorine dosing level is too low, algae will tend to become immune to low chlorine dosing levels over a period of one to two weeks, depending on the water temperature

To control the build up of algae in seawater systems, hypochlorite dosing should be only enough to maintain a small “Chlorine Residual” in the tail water system. Chlorine residual is the amount of chlorine left in the water after all bacteria, pathogens and marine species are destroyed. Chlorine residual can either be continuously or grab sampled in the tail water. This method will never allow shell build up to occur, however, should algae build up become apparent, the following operating methods should be followed to destroy the vegetable matter and keep the system free from bio-fouling.