moss & lichen
Hence, the major period of concern for spread is limited the high sporulation period. Quaternary Ammonium Compounds (DDAC) are not effective at killing spores due to the spores having a thickened cell wall. However, as the spores begin to germinate, they produce protonema which are thread-like filaments which grow and colonise the substrate on which they have established.
The protonema have thin cell walls and it is at this stage that the DDAC is able to penetrate protonema and disrupt the cells, killing the organism prior to it becoming established on surfaces. In addition to the effectiveness against moss, AlgoClear® Pro is an extremely effective algaecide and will be effective at reducing these species colonising most surfaces.