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.
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.