Question 1

What is greywater?

Accepted Answer

Greywater is gently used water from showers, baths, bathroom sinks, and washing machines. It does not include toilet water or kitchen sink waste.
*Aqua Gratis captures bath and shower water only, processes it and uses the greywater to flush toilets.

Question 2

Is greywater safe to use?

Accepted Answer

Yes. When treated with certified systems, greywater is safe for uses such as:
Toilet flushing
Garden/landscape irrigation
Clothes washing (in some regions)
Modern systems include filtration and disinfection to ensure safety.

Question 3

What can I use treated greywater for in my home?

Accepted Answer

Most customers reuse greywater for:
Flushing toilets
Watering gardens
Washing laundry
Feeding irrigation systems
Some systems, like Aqua Gratis, also recover heat from shower water to reduce energy bills.

Question 4

How much water can I save?

Accepted Answer

Typically 25–50% of your household’s potable water use.
This means lower bills, greater drought resilience, and reduced environmental impact.

Question 5

Is it legal where I live?

Accepted Answer

In the UK, yes.
Greywater reuse is permitted in many regions, but regulations vary.
Most areas allow irrigation and toilet flushing when using an approved system.
We can help you check local regulations during installation.

Question 6

Does greywater reuse require major plumbing work?

Accepted Answer

Not always.
New builds: very easy and cost-effective to integrate.
Retrofits: possible in most cases; you need to employ a plumber to assesses pipe access and space requirements.

Question 7

Will a greywater system change how I use my home?

Accepted Answer

Not at all. Treated greywater is supplied automatically to the toilets. You use bath, showers, and toilets, just as before.

Question 8

Does the water smell?

Accepted Answer

A properly installed and maintained system produces odour-free treated water.
Smells only occur when greywater sits untreated for too long — which modern systems are designed to prevent.

Question 9

How much maintenance is required?

Accepted Answer

Minimal. Aqua Gratis is self-cleaning. 
Aqua Gratis needs an annual service:
Filter checks 
Water treatment top up
The system is automated so there are alerts if a problem occurs.

Question 10

What happens if the system stops working or I go away?

Accepted Answer

Your home automatically switches back to mains water and the system safely bypasses unused greywater. You don’t need to do anything.
When you go on holiday set the system to Holiday Mode.

Question 11

How much does a system cost?

Accepted Answer

Costs depend on the type of home and installation complexity.
Most customers recover the investment through:
Reduced water bills
Reduced energy use (if heat recovery is included)
Increased property sustainability value
We can provide a personalised estimate.

Question 12

Does greywater reuse save energy?

Accepted Answer

Yes—especially if combined with heat recovery from shower water.
This can reduce hot-water energy use by 10–40%.

Question 13

Does it increase my property value?

Accepted Answer

Sustainability features are increasingly in demand.
Greywater reuse can make your home more attractive to environmentally conscious buyers and reduce long-term running costs.

Question 14

Why should I consider installing a greywater system?

Accepted Answer

Save water and money
Reduce environmental impact
Increase home resilience during droughts
Lower energy use (with heat recovery)
Contribute to sustainable urban water management

Frequently asked questions