How much greywater do you actually produce?

Your daily greywater volume is the foundation of every other sizing decision. It determines how often your pump cycles, how much water each plant receives per day, and whether your Aqua2use unit's tank capacity matches your household's output without overflowing on high-use days.

Standard per-person estimates — these vary with fixture efficiency, usage habits, and water-saving detergents, but are a reliable baseline for residential planning:

Example: a 4-person household using all three sources produces roughly 4 × (25 + 15 + 15) = 220 GPD.

Now connect that to tank capacity and pump cycles:

• GWDD (10.6 gal tank): 220 GPD ÷ 10.6 gal = ~21 cycles/day. One tank fill roughly every 70 minutes — normal, healthy operation.
• GWDD Pro (21.1 gal tank): 220 GPD ÷ 21.1 gal = ~11 cycles/day. One fill roughly every 2 hours.

Each pump cycle empties the tank through your drip system in a short burst — typically 60–90 seconds for the GWDD with the Standard kit, or 45–65 seconds with the Deluxe kit, depending on pipe configuration. With 30 plants on the Standard kit and 220 GPD, each plant gets about 7.3 gallons per day. With 50 plants on the Deluxe kit, it's about 4.4 gallons per plant. The interactive planner below calculates this automatically based on your specific setup.

What your plants actually need

Different plants have different water requirements, and those requirements determine how many emitter points you need across your irrigation field. With a greywater system, the key metric is gallons per plant per day — your total daily greywater volume divided by the number of plants on the system.

A practical rule of thumb for established landscape plants:

The adjustable barbed valves in both WWG kits let you dial in flow per plant individually — open the valve more for plants that need more water, close it down for ones that look waterlogged. This per-plant control is one of the key advantages over fixed-rate emitter systems.

One important consideration: greywater supply is not the same as irrigation scheduling. Your system delivers greywater when it's produced — morning showers mean water in the morning, laundry day means a larger pulse. The plants receiving it need to be able to handle that variability. Deep-rooted trees and shrubs handle greywater delivery patterns well. Vegetable gardens with precise watering needs are usually better served by a dedicated potable irrigation system.

Also, most greywater codes require subsurface drip or mulched distribution specifically because greywater shouldn't contact edible parts of plants or create puddles. Both WWG drip irrigation kits and Netafim Bioline are designed for this — emitters deliver to the soil, not above it.

Drip hardware — Standard Kit, Deluxe Kit & Bioline PC

WWG now offers two drip irrigation kits designed specifically for greywater systems. Both use the same Irritec A4-HTF155 high-flow Y-filter and the same adjustable barbed valve emitters — the difference is mainline size, zone count, and plant capacity. Here's how to choose.

WWG Standard Drip Irrigation Kit

The Standard kit is built around ½-inch Twist-N-Lok polyethylene mainline (0.600″ ID) — a compact, easy-to-install tubing system with tool-free push-fit fittings. It's the right choice for a single irrigation zone serving up to 30 plants on a flat or slightly downhill site. The ½-inch mainline has higher friction than the ¾-inch Deluxe mainline, which means the pump's available head goes mostly into pushing water through the line rather than building pressure at the emitters. That's fine — the adjustable barbed valves flow at any positive pressure — but it does mean the Standard kit needs flat terrain and short mainline runs to perform at its best.

Kit contents:

• 50 ft of ½-inch polyethylene mainline tubing (0.600″ ID) — Twist-N-Lok compatible
• 100 ft of ¼-inch micro-tubing for plant runs (0.170″ ID)
• One Irritec A4-HTF155 ¾-inch High Flow Y-filter (155 mesh / 96 micron, FHT swivel × MHT) — same filter as the Deluxe kit
• Twist-N-Lok reusable fittings: FHTS adapter, tee, 2× elbows, 2× couplers, 2× end caps
• 30 × ¼-inch adjustable barbed coupling valves
• 30 × ¼-inch barb couplings
• 30 × 6-inch stabilizer stakes
• 10 × Stay-Put wire anchors (galvanized steel)
• Universal Key Punch and 10 goof plugs

Standard kit contents laid out: 50 ft of ½″ mainline, 100 ft of ¼″ micro-tubing, Irritec Y-filter, Twist-N-Lok fittings, stakes, Stay-Put anchors, Universal Key Punch, and adjustable valves.

WWG Deluxe Drip Irrigation Kit

The Deluxe kit uses ¾-inch polyethylene mainline (0.820″ ID) — a larger bore that dramatically reduces friction loss compared to ½-inch tubing, leaving more of the pump's pressure budget available after the mainline run. This gives you meaningful headroom for elevation, longer runs, and two-zone setups. The Perma-Loc fittings make for a more permanent installation compared to the Twist-N-Lok fittings in the Standard kit.

Kit contents:

• 100 ft of ¾-inch polyethylene mainline tubing (0.820″ ID)
• 100 ft of ¼-inch micro-tubing for plant runs (0.170″ ID)
• Two Irritec A4-HTF155 ¾-inch High Flow Y-filters (155 mesh / 96 micron, FHT swivel × MHT) — one per zone
• Perma-Loc fittings (elbows, tees, end caps, couplers)
• 50 × ¼-inch adjustable barbed coupling valves
• 50 × ¼-inch barb couplings
• 50 × 6-inch stabilizer stakes
• 20 × stay-put wire anchors (galvanized steel)
• Key punch tool and 20 goof plugs

The Deluxe kit is sized for a 2-zone setup out of the box: split the 100 ft of mainline across two zones (50 ft each), distribute the 50 valves across both zones, and install a Y-filter at the head of each. The adjustable barbed valves work at any positive pressure — unlike pressure-compensating emitters, they don't require hitting a precise pressure window to function. This is why they're the right choice for greywater systems where pump pressure varies with pipe configuration and site elevation.

Deluxe kit contents laid out: 100 ft of ¾″ mainline, 100 ft of ¼″ micro-tubing, Irritec Y-filters, Perma-Loc fittings, stakes, punch tool, adjustable valves, and barb couplings.

Netafim Bioline PC (pressure-compensating dripperline)

Bioline delivers a consistent, pre-set flow rate regardless of pressure variation — useful on sloped sites or long runs where pressure varies across the field. Available in 0.4, 0.6, and 0.9 GPH emitter rates at 12-inch, 18-inch, and 24-inch spacing. It's a well-engineered product for the right application.

Aqua2use owners should keep in mind that Bioline needs a minimum of 7 PSI at the emitter to compensate. The GWDD maxes out at 10 PSI total system pressure, and the Pro at 11.3 PSI. After accounting for elevation, pipe friction, and any mainline run of meaningful length, emitter pressure in a real installation often falls below 7 PSI. Bioline works in compact, flat, very short-run configurations with either pumped unit — but that describes a specific minority of installs. For most sites, our greywater drip kits' adjustable valves are the more reliable choice because they don't require hitting a precise pressure window.

How pressure and flow connect

Three things determine whether water reaches your plants at the right pressure and flow rate. Understand these three and the planner below makes complete sense.

1. Your pump's pressure ceiling

Both Aqua2use pump models are sized to fit the demands of residential greywater use. The GWDD tops out at 23 ft, or about 10 PSI, and the Pro at 26.2 ft, or about 11.3 PSI. Their performance is aligned with the short, frequent run cycles typical of a residential greywater system rather than the longer, higher-pressure demands of conventional irrigation pumping. That makes them a strong fit for the WWG greywater irrigation kits, though with less extra pressure margin than a dedicated irrigation pump.

2. Friction loss

Every foot of pipe resists flow, and that resistance costs you pressure. The relationship isn't linear — double the flow and friction loss roughly quadruples. The key guideline: keep friction below 5 PSI per 100 feet on your supply pipe. The ¾-inch Deluxe kit mainline has low friction thanks to its 0.820″ bore. The ½-inch Standard kit mainline has higher friction — at typical GWDD flow rates, the mainline uses most of the available pump head, which is why the Standard kit is best kept to flat sites and short runs. We cover the specifics in the mainline sizing section below.

3. Elevation

Every 2.31 feet of uphill travel between the pump outlet and your emitters costs 1 PSI. Running downhill gives it back. A 10-foot elevation rise costs 4.3 PSI — nearly half the GWDD's total pressure budget. Elevation is often the biggest variable in greywater system design and the one people underestimate most. The Standard kit has very little pressure margin for uphill runs; the Deluxe kit fares better but still has limits.

Drip layout for each Aqua2use unit

Each model has a different pump, outlet size, and tank capacity — which means the mainline sizing, plant count, and layout approach differ meaningfully between them. Here's what works for each.

Gravity unit: no pump, no electricity. The elevation difference is your only pressure source.

Aqua2use Gravity — no pump, elevation only

The Gravity unit generates pressure purely from elevation. Every 2.31 feet of vertical drop between the unit's outlet and your emitters produces 1 PSI. You need at least 6 feet of drop for reliable operation — that's your first check for whether a gravity system works on your site.

• Max flow: 200 GPH (≈3.3 GPM) — all emitters combined
• Typical plant count: 3–6 plants
• Kit recommendation: Standard kit — plant count and flow rate are well-matched; the lower friction of the Deluxe's ¾″ mainline provides no advantage at 3.3 GPM max
• Supply pipe: 1-inch pipe from drain point M downhill to the irrigation area
• Critical rule: every segment of mainline must run downhill — no uphill sections anywhere
• PC dripperline: not compatible — gravity can't reliably hit the 7 PSI minimum

Fit a bypass tee with two inline valves on the 1-inch supply line so you can divert the sludge-laden flush water to the sewer during filter cleaning without disrupting the irrigation connection.

Aqua2use GWDD — ¼ HP · GR-32 · 1-1/4″ outlet · 10.6 gal tank

The GWDD is the right unit for most residential homes. Its GR-32 pump delivers 34.3 GPM max and 17.2 GPM at its rated head of 16.4 ft. The 10.6-gallon tank handles a typical 3–4 person household's greywater volume with 12–21 cycles per day.

• Pump: GR-32, ¼ HP — 34.3 GPM max, 17.2 GPM @ 16.4 ft, max head 23 ft (10 PSI)
• Outlet: 1-1/4″ hose barb → reducing adapter to supply pipe
• With Standard kit: 1″ supply pipe to Y-filter, then ½″ Twist-N-Lok mainline — best on flat or downhill sites, mainline runs under 40 ft, up to 30 plants in 1 zone
• With Deluxe kit: 1″ supply pipe to manifold, then ¾″ mainline through each zone with Y-filter at the head — up to 50 plants across 1–2 zones, handles moderate elevation and longer runs
• Bioline PC: marginal — works only on very short, flat runs where friction losses are minimal

The GWDD's EPC handles cycling automatically, including the daily purge cycle. You don't need a separate timer. Flush end caps seasonally and clean the screen Y-filters every time you service the Matala filters.

Aqua2use GWDD Pro — ⅓ HP · MFP-300 · 1-1/2″ outlet · 21.1 gal tank

The Pro is the right unit for larger homes, ADUs, multi-zone setups, and any site where an underground installation is preferred — the tank lid sits flush with grade. The MFP-300 pump delivers 48 GPM max and 23.8 GPM rated, with the larger 21.1-gallon tank handling higher daily greywater volumes in fewer pump cycles.

• Pump: MFP-300, ⅓ HP — 48 GPM max, 23.8 GPM @ 16.4 ft, max head 26.2 ft (11.3 PSI)
• Outlet: 1-1/2″ → surface-level supply connection
• With Standard kit: works well for compact single-zone installs; the Pro's higher flow rate gives the Standard kit slightly faster cycles
• With Deluxe kit (up to 25 plants): 1-inch poly supply, then ¾″ kit distribution
• With Deluxe kit (larger installs): 1-1/4-inch poly supply keeps friction under 5 PSI per 100 ft at 20+ GPM
• Typical plant count: 25–50+ across 2 zones
• Bioline PC: marginal — the 11.3 PSI max head leaves little pressure margin after friction and elevation

Pro pump curve: 48 GPM at zero head tapering to shutoff at 26.2 ft. Design around the rated point, not the maximum.

GWDD Pro customer install: the unit drops into its excavation and the lid ends up flush with the surrounding surface.

The Pro's larger filter area extends cleaning intervals to 6–12 months in typical household use. Same EPC logic as the GWDD, same daily purge guarantee, same zero-timer-needed operation.

Interactive irrigation planner

Use the planner below to check whether your planned setup works — select your kit (Standard or Deluxe), choose your Aqua2use unit, dial in your site conditions, and the planner calculates pump operating point, Y-filter pressure drop, friction loss, and exact kit coverage in real time.

Not a substitute for a professional system design — always confirm with a licensed irrigation designer for permitted installations.

Mainline sizing and friction loss

Your greywater system has two types of pipe: the supply pipe from the Aqua2use outlet to your manifold/irrigation area, and the kit mainline that distributes water through each zone to the individual plant runs. The mainline size is now part of your kit choice — ½-inch for the Standard kit, ¾-inch for the Deluxe — and the supply pipe diameter is the biggest remaining lever for controlling friction loss.

The practical guideline: keep friction below 5 PSI per 100 feet on the supply pipe. That leaves enough pressure budget for the Y-filter, kit mainline, and elevation. Here's how the most common supply pipe sizes compare at typical GWDD flow rates:

The ½-inch Standard kit mainline (0.600″ ID) has high friction — at 8 GPM, it's about 27 PSI per 100 feet. That means the pump's available head goes almost entirely into pushing water through the tubing, leaving near-zero residual pressure at the emitters. This works fine because the adjustable barbed valves flow at any positive pressure — but it does mean mainline runs longer than 40 ft, any uphill elevation, or very long supply pipes will reduce performance noticeably.

The ¾-inch Deluxe kit mainline (0.820″ ID) has much lower friction — under 1 PSI through a 50 ft zone run at typical GWDD flow rates. This means most of the pump's pressure reaches the emitters, and you have real margin left for elevation and supply pipe length. The supply pipe and elevation are the primary friction factors in most Deluxe kit installations.

A few rules that save time:

• Standard kit: keep everything short and flat. Runs under 40 ft, flat or downhill terrain, supply pipe no longer than 25 ft if you can help it. The ½-inch mainline doesn't leave margin for much else.
• Deluxe kit: upsize the supply pipe on longer runs. The cost difference between ¾" and 1" poly is small. The pressure difference at 10 GPM is significant — 8.2 vs 2.7 PSI per 100 ft.
• Friction multiplies with length. 5 PSI per 100 ft sounds fine until your run is 150 ft — now that's 7.5 PSI gone before you count elevation or the Y-filter.

Filtration for drip systems

The Aqua2use's four-stage Matala filter stack handles the bulk of the solids load — lint, hair, soap particulates, and fine organic matter. What comes out the other side is noticeably cleaner than what went in. But it's not perfectly clean, and the ¼-inch barbed valves benefit from a second stage of filtration to catch residual fines.

Both WWG kits include the Irritec A4-HTF155 ¾-inch High Flow Y-filter (155 mesh / 96 micron, FHT swivel × MHT connections) — one in the Standard kit, two in the Deluxe kit. This is a high-quality stainless steel screen filter rated to 22 GPM, well above the typical 8–11 GPM operating point of most GWDD and Pro installs. At those flow rates, pressure drop through the filter is about 1.2–1.9 PSI — modest enough that it doesn't meaningfully constrain the system. The planner accounts for this automatically using the official Irritec spec (8 PSI at 22 GPM max).

The FHT swivel inlet lets the filter connect directly to garden hose thread fittings — in the Standard kit, the included Twist-N-Lok FHTS adapter connects it straight to the ½-inch mainline. In the Deluxe kit, a ¾" GHT-to-Perma-Loc adapter connects each filter to the ¾-inch mainline at the head of each zone.

When to clean the Y-filters: every time you service the Matala filters — every 4–6 months for the GWDD, 6–12 months for the Pro. Unscrew the bottom cap, pull the stainless steel screen element, rinse under a hose until clean, and reassemble. If you notice uneven emitter performance or dry patches in your irrigation field, check the Y-filters first before digging into the mainline. A clogged screen is the most common cause of sudden pressure drop in an otherwise well-designed system.

If your household uses high-soap laundry detergents or grease-cutting products in greywater, you may need to clean the Y-filters more frequently than the Matala media schedule suggests. The filter will tell you — emitter performance will drop noticeably when the screen is restricting flow.

Seasonal maintenance

A well-installed greywater drip system doesn't need much — but the maintenance it does need is worth doing on schedule. Here's the realistic cadence:

Monthly — quick visual check

• Walk the irrigation field and look for dry patches (emitters not opening) or puddles (emitters over-delivering or clogged open)
• Confirm the Aqua2use unit is cycling normally and the diverter valve is in the correct position

Seasonally — flush and inspect

• Open the flush end cap at the end of each lateral and let water run until clear — this flushes accumulated sediment from the line
• Inspect micro-tubing for kinks, root intrusion near emitter points, or degraded stabilizer stakes
• Clean the Irritec screen Y-filter(s) at each zone head and inspect the Aqua2use diverter valve for debris

At Matala filter service (every 4–6 months for GWDD, 6–12 months for Pro)

• Per the installation manual: turn diverter valve to bypass, drain via fitting M, remove filters one at a time in order (Black → Green → Blue → Grey), gently tap on a flat surface to displace sediment, rinse until clean, reinstall in the same order
• Use this service as the trigger to flush the full irrigation system — open all end caps before reinstalling the filters
• Clean all Irritec Y-filters at the same time (1 for Standard, 2 for Deluxe)
• Inspect float sensors and EPC indicator lights while the lid is open

Before winter (cold climates)

• Drain all mainlines and laterals — residual water in poly tubing can crack fittings in hard freezes
• Remove and store micro-tubing if temperatures will drop below 25°F for extended periods
• Switch the Aqua2use diverter to bypass during extended periods of non-use, and do a full filter service before decommissioning for the season (per the installation manual)

Most greywater systems in mild climates can run year-round without winterizing. If you're not sure whether your climate warrants it, the general rule is: if you'd drain your outdoor hose bibs, drain your greywater mainlines too.

Ready to start your installation?

If the planner above confirmed your site and plant count work with your chosen unit and kit, you're ready to move forward. If you're still deciding between the Standard and Deluxe kit — or between the GWDD and Pro — run the planner with your real plant count and site elevation. The numbers will tell you which combination has the headroom to handle it.

For questions about permitting requirements in your state, installer referrals, or more complex multi-zone or commercial designs, get in touch with us directly. We're happy to look at your specific site conditions and help you design a system that actually works.

Frequently asked questions