Grey Hub Irrigation, Logo

Toll Free


Q - Is greywater recycling legal?
A -
Yes, Universal Plumbing Code and California Plumbing Code allow greywater.

Q - Do I need special soaps?
A -
Generally powders are bad, we recommend Bio-compatible or Bio-degradable soaps, available from your common grocery stores.

Q - Can I spray greywater?
A - No, by code greywater must not come in contact with people or animals.

Q - Can I store greywater in a tank?
A -
No, greywater creates sludge on everything it touches including tank walls, pumps, and sensors. Greywater should be dispersed as soon as possible to avoid sludge build up.    

Q - How do I water while on vacation?
- We have different ways to achieve this, contact us to discuss your personal options.

Q - Can I connect my existing irrigation system to my greywater system?
A -
No, no cross connection with potable water irrigation systems is allowed and greywater will clog your systems emitters. We use specially engineered drip line.

Q - Will using a greywater system hurt my septic system?
A -
No, your septic system will function better with the soaps and extra load removed. We have experienced less system maintenance with a greywater system in place.

Q - How much laundry water do I make?
A -
Every person in the home counts as 15 gallons of laundry a day, 456 gallons a month and 5,475 gallons a year.

Q - How much total greywater tubs, showers, sinks, and laundry do I make?
A -
1 person makes 14,600 gallons a year tubs, showers, wash sinks, and laundry count as 40 gallons per person per day.

Q - How much money can I save?
A -
Contact us for a cost analysis on your project.

Q - What saves more water greywater or rain catchment?
A -
Greywater can save 14,600 gallons per person per year dispersed as you make it. Rainwater depends on amount of rain collection area and storage capacity.

Q - What is more economical to install greywater or rain harvesting?
A -
 G-Flow for 1 person, laundry only will recycle 5,475 gallons annually for landscape irrigation. G-Flow Package Deal $895 comes with G-Flow basin, 3 way diverter valve, filters, pump, 1 - 328’ roll of drip line, 100’ roll of 1” main line, and fittings. G-Flow on average is a DIY 1 day install. Compare the $895 G-Flow Package Deal to a 4995 gallon Rain Catchment tank (4995 to avoid a permit for 5000+) without foundation, wiring, piping, pump, etc at $2,295, the G-Flow is smaller, less than half the price, and recycles more water. More people in the home means more water recycled.

Q - Can I flush toilets with my greywater?
A -
No, not allowed for in home yes unless treated. Raw greywater added to a toilet will turn it into a petri dish of bacteria and become anaerobic. Check out this Case Study Kohler Greywater

Q - Can I reuse greywater in my home?
A -
Greywater must be treated to be reused in the home which drives up system costs and maintenance. We recommend keeping it simple and reusing greywater for landscape irrigation avoiding water restrictions and offsetting your highest tier water cost.

Q - How long until my greywater system pays me back?
A - Depending on your individual water and sewer rate a greywater system can pay for itself in as little as a year.

Q - Can I use rainwater in my greywater system?
A - Yes, you can connect your rain tank as a feed to your greywater system and utilize the pump, distribution piping and drip line to save money. We DO NOT reccommed connecting rain gutters to the system ever. Greywater systems cannot keep up with the flow from a downpour and end up sending the excess water to the sewer or septic. It is not legal to send storm water to the waste water system.

Q - What is better, a pump system or gravity fed?
A - A gravity fed system is great for small flat or down sloping yard. You can usally water about 10 trees or plants on gravity fed systems. Pump systems can irrigate over 100 plants and trees with multiple zones through highly efficent drip irrigation. 

Q - Do I need a permit?
A -
No and Yes. No permit for a typical clothes washer system. Yes you need a permit for a pumped system called a simple system. We have permit submittals and can help make it easy.

Q - How big of a yard can I water?
A -
See the garden sizing chart.

Q - Can I use untreated greywater for a water feature?
A -
No, untreated greywater can not be used in any way that exposes it to people or animals.

Q - Can I use greywater if I have a water softener?
A -
Yes, but you will need to switch to potassium pellets to avoid salt build-up in the soil.

Q - Can I reuse kitchen water?
A -
Kitchen water is considered black water by code and cannot be reused through a greywater system.

Q - Will a greywater system damage my washing machine?
A -
Grey Flow system cannot effect your laundry machine pump because we use our own pump. Beware of systems using your washing machine as a pump, they can put added resistance to the machine resulting in failure.

Q - What is duel plumbing?
A -
Duel plumbing is separate blackwater and greywater plumbing in a home. Generally the greywater pipe will exit the home higher than the blackwater pipe and tie into the sewer/ septic pipe before the sewer or septic system.

Q - Can I water my lawn with greywater?
A -
Yes, we have special greywater sub-surface drip lines. Contact us to find out if this is a option for you.

Q - Can I use a rain sensor to turn off my system when it rains?
A -
Yes, our systems can incorporate a rain sensor contact us for detailed instructions.

Q - Can I use a sand filter?
A -
Sand filters require a cross connection with the potable water supply which requires a special back flow preventer to protect the city water supply and annual inspections (no less than once every 4 years). Sand filters also use 30 to 50 gallons of fresh water every time they back flush. A typical problem with sand filters is when the sand filter is full of sludge and it’s time to change the sand who changes it and where do you dispose of the sand sludge. Our systems use air to back wash right into the sewer so you have NO potable cross connection, NO annual inspection, NO fresh water wasted for back wash, and NO disposal of sand sludge.

Q - How long do the pumps last?
A -
Grey Flow pumps last an average of 8 years.

Q - How should I prioritize my landscape for greywater use?
A -
We recommend prioritizing trees first to lower the temperature and buffer the wind to lower evaporation of water used and in your soil.

Q - Will greywater provide for all my irrigation needs?
A -
To only use greywater for irrigation the landscape demand must match the amount of greywater produced. We have expert installers that can design the irrigation demand to your greywater production.

Q - What is my Return on Investment for a greywater system?
A -
Greywater systems have great returns, contact us to get a complete cost analysis (ROI).

Q - Are there any Government incentives for greywater systems?
A -
More and more cities are offering incentives for greywater, you can look up your own cities website or contact us and we will help.

Q - How do I make more than one zone for greywater irrigation?
A - Grey Flow G-Rotor can accommodate 2 to 6 zones changing zones every 13 gallons for a automated system or you can make a PVC manifold for manual zone changing.

Q - Can I use off brand drip line or emitters?
A - No, greywater will almost instantly clog non greywater emitters and drip line see sludge on our greywater page.

Q - Do I have to use a Grey Flow installer / contractor?
A - No, we can consult and train your contractor if you like.

Q - Do I need a standard irrigation system still?
A - Some people do rely on greywater alone for their landscape irrigation demands. Understand greywater is a set calculated water supply and demand must coincide with supply to rely soley on greywater.