Greywater Knowledge Quiz

What is greywater?

• Water used for heating

• Water from toilets

• Wastewater from baths, showers, basins

• Rainwater from gutters

Answer explanation

Greywater refers to wastewater generated from baths, showers, and basins, excluding water from toilets. It is distinct from other types of water like rainwater or water used for heating.

Which of the following is a permitted use for greywater?

• Drinking

• Washing dishes

• Flushing toilets

• Food prep

Answer explanation

Greywater can be safely used for flushing toilets, as it is non-potable water from sinks, showers, and laundry. However, it is not suitable for drinking, washing dishes, or food preparation due to health risks.

Why should untreated greywater not be stored for long periods?

• It freezes

• It evaporates

• It promotes bacterial growth

• It solidifies

Answer explanation

Untreated greywater should not be stored for long periods because it promotes bacterial growth. This can lead to health risks and unpleasant odors, making it unsafe for reuse or disposal.

Which of the following would disqualify a home from greywater system suitability?

• Small garden

• Low greywater discharge

• No shower

• Gas heating

Answer explanation

Low greywater discharge disqualifies a home from greywater system suitability because insufficient water output limits the effectiveness of the system. Other options like a small garden or gas heating do not inherently disqualify a home.

Which classification applies to greywater under regulations?

• Class 1

• Class 2

• Class 5

• Class 3

Answer explanation

Greywater is classified as Class 5 under regulations, indicating it is non-hazardous and can be reused for irrigation and other purposes, distinguishing it from more contaminated water types.

What’s the safest method for using greywater in the garden?

• Spraying plants

• Soil application only

• Filling birdbaths

• Using it for seedlings

Answer explanation

Soil application only is the safest method for using greywater, as it minimizes direct contact with plants and reduces the risk of pathogens. Other methods, like spraying or filling birdbaths, can pose health risks.

Why is floating extraction preferred in greywater systems?

• Aesthetic purposes

• Cheaper installation

• To avoid sediment

• Easier maintenance

Answer explanation

Floating extraction is preferred in greywater systems to avoid sediment buildup, which can clog the system and reduce efficiency. This method helps maintain cleaner water flow and prolongs the system's lifespan.

Which component is always required to prevent contamination of backup water?

• Overflow pipe

• Double pump

• Type AA air gap

• Filter pad

Answer explanation

A Type AA air gap is essential for preventing contamination of backup water by ensuring a physical separation between the potable water supply and the non-potable water, thus protecting against backflow.

What is the purpose of an intermediate cistern?

• Increase pressure

• Hold water temporarily for distribution

• Backup storage

• For drinking

Answer explanation

The purpose of an intermediate cistern is to hold water temporarily for distribution. This allows for efficient management of water supply before it is delivered to end users.

What planning condition may require permission?

• Adding a kitchen sink

• Internal tanks

• Above ground storage tanks visible externally

• Rainwater reuse link

Answer explanation

Adding above ground storage tanks that are visible externally may require planning permission due to their potential impact on the environment and aesthetics, unlike internal tanks or minor installations like kitchen sinks.