Moulds are from the fungus group and they need water to grow. While their main function in the outdoor environment is degradation of wood, bark, shrubs and grasses, indoors they range from being unobtrusive microbial guests to obtrusive microbial pests.

Moulds can cause respiratory issues, and they may affect well-being in many ways. They are definitely a challenge to the immune system. When mould spores are encountered in vanishingly small amounts, the average uncompromised immune system may cope and even be strengthened by the odd encounter, but for the very…