Ozzi Kleen Septic System Guide: RP10 Models, Alarms, Servicing and Common Faults

An Ozzi Kleen is a single round poly tank that treats all your household wastewater by aerating it in timed cycles, then settling, decanting, chlorinating and pumping the treated water out to your irrigation area. In NSW the family is the RP10 plus three nutrient-reduction versions (RP10A+, RP10S and RP10S+), all rated for up to 10 people, and all needing a service every three months by an agent the manufacturer has authorised.

That sets it apart from most aerated wastewater treatment systems (AWTS) in the Hunter. The standard RP10 has no septic chamber doing the first stage, the blower doesn’t run around the clock, and sludge goes to a small internal tube. Those differences change how you read the alarm panel and how desludging works.

Our AWTS brands comparison sets Ozzi Kleen beside other brands. This guide works from the owner’s manual and the NSW Health certificates.

How an Ozzi Kleen treats wastewater

Ozzi Kleen is made by Suncoast Waste Water Management at Kunda Park on the Sunshine Coast. Treatment runs as a repeating batch, controlled by an electronic board the manual calls the OK1 controller:

1. Aeration. A blower pushes air through diffusers in the main tank. Bacteria feed on the waste and form what’s called activated sludge.
2. Settling. The blower stops for roughly 30 minutes. The sludge sinks and a layer of clear water forms at the top.
3. Decanting. A floating decanter draws off the clear water from just under the surface. It runs by gravity through a chlorinator, then into an effluent compartment.
4. Pumping out. When the effluent compartment fills, a float switch starts a submersible pump that sends the treated water to your irrigation.

Excess sludge is pumped into a 350 litre sludge holding tube, where it thickens. The watery part flows back to the main tank and the solids stay until removed.

Because the blower runs in cycles, the manufacturer’s FAQ puts power at roughly 35 cents a day. That’s Ozzi Kleen’s estimate, not ours. The manual rates the blower at 120 watts and the effluent pump at up to 400 watts.

The RP10 family and the NSW Health register

NSW Health accredits each AWTS design under the Local Government (General) Regulation 2021. Section 41 says a council can’t approve a new install of a retail AWTS unless its design holds a certificate that is in force, and each certificate sets conditions your council applies to your approval to operate. Here’s how the Ozzi Kleen certificates stood when we checked the register and downloaded each certificate on 28 September 2026 (the register page was dated 22 September 2026).

The nutrient-reduction models dose alum. All three NR certificates describe alum dosed during aeration to bind phosphorus into the sludge, and each tells the council to make sure the unit has an alum dosing unit and a modified controller. If your approval says NR, that dosing gear is part of staying compliant.

The S models add a primary stage. The RP10S and RP10S+ specifications list an 850 litre primary treatment and pre-aeration stage ahead of the main chamber. The RP10 and RP10A+ don’t have it.

“Advanced” is a tested standard. The RP10A+ and RP10S+ certificates record that each met the advanced secondary effluent criteria in AS 1546.3:2017, a tighter bar than the secondary limits every model must meet.

Three certificates run out on 31 December 2026. The RP10 certificate was issued on 13 August 2026. The NR certificates were issued in August 2022. If you already have an NR unit in the ground, ask your council what an expiry means for your approval to operate. It matters most for a new install next year, so ask Ozzi Kleen or your council whether the renewal has gone through before you lodge a Section 68 application. The manual also mentions an RP10A, which wasn’t on the NSW register when we checked.

Reading the alarm panel (and the 9 hour mute)

Every Ozzi Kleen has a small alarm panel inside the house, and the light tells you more than the buzzer.

When the alarm sounds, press the mute button. The manual says the buzzer stays quiet for 9 hours, and pressing mute again (or resetting the OK1 controller) buys another 9 hours. The light keeps flashing while it’s muted, so the fault is still there.

High water alarm. The manual lists these causes:

• A surge of water, like several washing loads in a row or a drained spa. The plant goes into settle and decant mode on its own, and after about 30 minutes the effluent pump should start and the alarm clear.
• A blocked basket strainer, decant pipe or chlorinator.
• The effluent pump not running: no power, a stuck float switch, or a motor fault.
• Blocked sprinklers or drippers. The manual says to check these before asking for a service call.
• A dirty sock filter, if fitted.

If the fast flash is still going well after that 30 minutes and your sprinklers are clear, cut water use and call your service agent. An active high-water alarm gets same-day or next-morning response from us. Our guide to why an AWTS alarm beeps covers causes across brands.

Low air alarm. The slow flash points to the blower side: a broken air line, ruptured diffusers, a faulty blower or its protection switch. The manual’s remedy for each is to call your service provider.

Never switch it off. The manual says the main switch stays on at all times. In a blackout, go easy on water: there’s about 1,000 litres of storage before it overflows.

Servicing: what the certificate requires and what it costs

The RP10 certificate sets out the owner’s side plainly:

• You must hold a service contract of at least 12 months with a service agent.
• The unit is serviced every three months, to the manufacturer’s service manual and on its service sheet.
• The agent has to be employed or authorised by the manufacturer, and must send a NSW Health service report to your council after every service.
• You can’t service it yourself unless you’re an authorised agent of the manufacturer.

Ozzi Kleen trains its agents in-house and issues an Ozzi Kleen Green Card, renewed every two years. Its warranty says you may void the warranty if an approved Green Card agent doesn’t service the system, so before you sign a contract with anyone, us included, ask to see a current Green Card. The manufacturer’s online agent finder lists agents covering Hunter council areas including Maitland, Cessnock, Singleton, Port Stephens, Dungog and Muswellbrook.

Each quarterly visit must check the chlorinator, pump, blower, alarm, sludge return and irrigation area, with on-site tests for free chlorine, pH and dissolved oxygen. Ozzi Kleen adds a settling test for sludge and a clean of the blower air filter every time.

Our quarterly AWTS servicing runs $90 to $150 a visit, or $360 to $600 a year, including chlorine replenishment, the sludge test, blower filter cleaning and lodging the service report with council. Ozzi Kleen’s servicing page says owners are invoiced a service fee plus the cost of chlorine, and of aluminium sulphate on the dosing models, so ask any agent what their fee includes. What a visit involves is on our AWTS servicing page.

Chlorine between services. The manual says each service should leave at least two kilograms of tablets in the chlorinator, with room for up to four. If they run out early, the manual allows jumbo pool chlorine tablets from a supermarket or pool shop.

Desludging an Ozzi Kleen

This is where owners get mixed messages. Ozzi Kleen’s FAQ says that under normal circumstances the RP10 should never need pumping out, because solids are broken down continuously. The NSW certificate is more precise: waste sludge collects in the sludge holding tube, the concentrated solids “are eventually pumped out for disposal”, and at every three-monthly service the agent must decide whether the sludge tube needs emptying.

So the 3 to 5 year desludge you’d plan for on most AWTS is a rough guide at best here. On an Ozzi Kleen, the settling test at each service decides when the sludge tube needs emptying.

Two points from the manual matter here:

• The treatment plant is never to be emptied without prior consent from the manufacturer or your service provider.
• The troubleshooting table lists pumping out and refilling the aeration tank as a remedy when toxic chemicals have killed off the bacteria.

When removal is needed, we quote before we start; a full AWTS desludge and total pump-out runs $450 to $750. Waste is transported and disposed of under NSW EPA waste rules at a licensed treatment facility, and a disposal docket is provided for every load. Keep it with your service reports.

Common faults and what they usually cost

The manual and certificate between them name the usual suspects.

Float switch out of its groove. The certificate explains that the effluent pump’s float cable sits in a groove on the pump handle. If it slips out and hangs free, the float can’t switch the pump off, so the pump runs dry and fails early. Putting it back means lifting the pump out, which is a job for your service agent.

Blocked irrigation. Clogged sprinklers cause ongoing high water alarms, and the manual warns that long alarm periods stop treatment and lead to odours.

Smells from the tank. The manual’s causes include power turned off, bacteria killed by harsh cleaners, chemical toilet contents or heavy antibiotic use, blocked or ruptured diffusers, too much fat or food scraps, and a plant used before commissioning.

Chlorine smell inside the house. The manual points to dry floor-waste gully traps, a badly placed drainage vent or incorrectly installed pipes. Tip water into the gullies first; if it persists, call your plumber.

Foaming on a new system. Laundry suds can foam on a fresh plant until the biology builds up over a few days.

Blower and pump failures. Check the warranty first. Ozzi Kleen’s warranty runs from the date of purchase: 36 months on the air blower, submersible pump and electronic control box, 12 months on other electrical components and 15 years on the main tank. It holds only if the unit has been serviced every three months by an authorised provider, and a claim may be rejected if the plumber’s installation and commissioning certificates were never returned. It covers parts, not labour, travel or callout costs. Outside warranty, a blower diaphragm service kit runs $120 to $250, an air blower replacement $650 to $1,400 installed, and an irrigation pump replacement $600 to $1,200 installed. We diagnose before we replace; a float switch or similar fault is typically a $250 to $650 repair. More on blowers in our air blower replacement cost guide.

Ozzi Kleen on Hunter properties: floods, holidays and buying

Flood-prone blocks. The installation instructions say a plant installed in a watercourse or flood-prone area will have to be relocated, and the green motor box must sit at least 50 mm above finished ground. The warranty treats flooding and water damage as conditions that void it. If your unit has been under water, read what to do with a septic system after flooding and get it checked before you rely on it.

Going away. If the house will be empty for 4 weeks or more, the manual says to ask your service provider for advice first. Don’t just switch it off.

Tenants and guests. The manual suggests a sign in the toilet listing what can’t go in, and a bin for sanitary items. On a rental or holiday let, that’s cheap insurance.

Buying a place with an Ozzi Kleen. Ask the vendor for the model, the council approval to operate, the service contract and recent service reports. Our real estate septic inspection costs $250 to $500 and includes a written report.

The price of a new one. Ozzi Kleen doesn’t publish retail prices; its FAQ sends buyers to a local distributor. Our guide range for a complete new AWTS installation is $15,000 to $25,000-plus, depending on site, soil and irrigation design. Installation, excavation and pipework are carried out by licensed plumbing and drainage contractors we work with; their NSW licence number appears on every quote.

If your panel is flashing, your service contract has lapsed, or you’ve just bought a place and don’t know when the unit was last serviced, call 0468 278 123 and tell us the model on the motor box.

Frequently Asked Questions

Does an Ozzi Kleen RP10 need pumping out?

Not on a fixed schedule like a conventional septic tank. Sludge collects in a small sludge holding tube, and the NSW accreditation requires your service agent to check at every quarterly service whether it needs emptying. The manual says the plant must never be emptied without consent from the manufacturer or your service provider.

How long does the Ozzi Kleen alarm mute last?

The owner’s manual says pressing mute silences the buzzer for 9 hours. Pressing it again, or resetting the OK1 controller, extends it by another 9 hours. The light keeps flashing while the buzzer is muted, so the fault still needs fixing.

What does a fast flashing light on an Ozzi Kleen alarm panel mean?

A fast flash, roughly every half second, is a high water alarm. It’s often a surge of water that clears itself after about 30 minutes as the plant settles and decants, but it can also mean blocked sprinklers, a blocked strainer or chlorinator, or an effluent pump that isn’t running. A slow flash, roughly every 3 seconds, means a low air fault on the blower side.

Are Ozzi Kleen systems approved in NSW?

Yes. As at 28 September 2026 the NSW Health register lists four models: the RP10 (certificate expires 14 August 2031) and the nutrient-reduction RP10A+, RP10S and RP10S+ (all showing an expiry of 31 December 2026). If you plan a new install of an NR model in 2027, check with Ozzi Kleen or your council that the certificate has been renewed.

Can any AWTS technician service an Ozzi Kleen?

The NSW certificate requires a service agent who is employed or authorised by the manufacturer, and the warranty requires an approved Ozzi Kleen Green Card agent. Ask any provider to show a current Green Card before you sign a service contract. You can’t service the unit yourself unless you’re an authorised agent.

How much does an Ozzi Kleen cost to run?

Ozzi Kleen’s own FAQ estimates power at about 35 cents a day, because the blower runs in cycles rather than non-stop. On top of power, budget for quarterly servicing; our AWTS servicing is $90 to $150 a visit including chlorine. Ozzi Kleen says each service is invoiced as a fee plus the cost of chlorine, and aluminium sulphate on nutrient-reduction models, so ask what a quote includes.

Sources and further reading

• NSW Health, Register of certificates of accreditation (AWTS): the four Ozzi Kleen models, certificate numbers and expiry dates; page current as at 22 September 2026, checked 28 September 2026.
• NSW Health, Certificate STS-AWTS056, Ozzi Kleen RP10: treatment process, chamber capacities, 350 litre sludge tube, float cable warning, service agent and contract conditions, quarterly service checklist, reissue and expiry dates.
• NSW Health, Certificate STS-AWTS061, Ozzi Kleen RP10A+: alum dosing, advanced secondary criteria and nutrient reduction results.
• NSW Health, Certificate STS-AWTS062, Ozzi Kleen RP10S: 850 litre primary stage, alum dosing and nutrient reduction results.
• NSW Health, Certificate STS-AWTS063, Ozzi Kleen RP10S+: advanced secondary criteria and nutrient reduction results.
• Ozzi Kleen, RP10/RP10A/RP10A+/RP10S/RP10S+ Owner’s Manual (Rev 7, 2023): alarm lights and 9 hour mute, troubleshooting table, power ratings, chlorine tablets, emptying rule, vacation advice, installation requirements and capacity rating.
• Ozzi Kleen, Residential Manufacturer’s Warranty: warranty periods, Green Card servicing condition and exclusions including flooding.
• Ozzi Kleen, FAQs: the manufacturer’s statements on pumping out, running cost (about 35 cents a day) and pricing through distributors.
• Ozzi Kleen, Servicing: Green Card training and renewal, service criteria, and chlorine and aluminium sulphate charges.
• Ozzi Kleen, Find a service agent: NSW agents and the Hunter council areas they list.