Vegetation on your roof and in your gutters can reduce the volume of water you capture due to splashing, spillage and obstructed water flow.
In some cases, vegetation build-up may completely block the flow of water. Both these forms of water loss can reduce the volume of rainwater that ends up in your tank.
Obstructed water flow creates pooling water in your gutters. This can attract mosquitoes, possums and other pests that contaminate your system as they use this pooled water to drink and breed.
Animals on overhanging trees can also contaminate your water as they leave behind urine, faeces, fur, feathers, hair and discarded food.
Decomposed vegetation in your gutters can support the growth of weeds and moss, further obstructing and contaminating your water.
In wet systems*, anaerobic fermentation can occur as broken down leaves submerged in water-filled pipes produce sludge, nasty smells and foul water that’s pushed into your tank the next time it rains.
Submerged leaves in your system can increase your water’s acidity, while the tannins they release can turn your water yellow or brown.
Broken down leaves and other vegetation can form sediment that ends up in your tank, blocking treatment systems and increasing the loading on your pumps and filters.