If you own a home on an onsite wastewater system, what goes down your drains will make or break the health of your septic tank or AWTS (Aerated Wastewater Treatment System). As an Australian-made manufacturer, Eco Septic sees the same avoidable issues over and over: wipes that don’t break down, fats that clog lines, and “just a splash” of harsh chemicals that quietly sabotage the living bacteria inside your system. This guide explains exactly what not to send into your system, why, and what to do instead—so you enjoy years of odour-free, compliant operation.
How a septic/AWTS actually works (and why inputs matter)
Your system is a biological treatment plant. In primary chambers, solids settle and scum floats; in secondary treatment (for AWTS), aeration and beneficial bacteria further treat the wastewater before irrigation. When you flush or pour non-biodegradable items or toxic substances, you either:
Physically block pipes, pumps, filters and sprinklers, or
Kill or inhibit the bacteria your system relies on.
Either way, the result is predictable: backups, odours, alarms, poor irrigation performance, and expensive call-outs.
The “never-ever” list (place these at every fixture)
Toilets:
“Flushable” wipes (they aren’t), paper towels, tissues
Nappies/diapers, sanitary pads/tampons, condoms
Cotton buds, dental floss, hair, dental picks
Cat litter (including “septic safe”), cigarette butts, fabric offcuts
Kitchen & laundry sinks:
FOG: fats, oils, grease; gravy; pan drippings
Coffee grounds; rice/pasta; fibrous peels (pumpkin, celery)
Food scraps in general—use the bin, not the sink
Harsh chemicals: drain openers, oven cleaner, solvents, thinners, paint wash-out
Pesticides/herbicides, pool/spa water (chlorine and salts disrupt biology)
Cement slurry, grout residue, tile adhesive rinse-water
Microbeads, glitter, clay, plaster
Large doses of bleach or disinfectants (“shock dosing”)
Bathroom basins & showers:
Shaving waste with hair/floss, cosmetic wipes, cotton pads
Beauty product sludges (clays, heavy oils), nail polish remover/acetone
Laundry specifics:
Over-dosing detergents and softeners (use septic-friendly options, follow dosing)
Dye baths and stain removers with solvents/oxidisers
Mop bucket “everything soup”—empty outside to the bin when contaminated with solvent/paint residues
Why these cause real damage (not just “best practice”)
Clogging & binding: Wipes, hair and floss braid together; add FOG and you get a ropey, glue-like mass that stops impellers and blocks irrigation sprinklers.
Bacterial die-off: Solvents, pesticides and large bleach doses kill your microscopic workforce. Treatment quality drops; smells rise.
Excess sludge: Non-degradables accumulate, forcing premature pump-outs and risking solids carry-over into pumps and irrigation.
Corrosion & component wear: Chemical misuse accelerates failure of pumps, floats, seals and valves—costing you more than any bin liner would.
Smart substitutions (keep habits, change the destination)
Wipes: Bin them. Place a small lidded bin in every toilet.
FOG: Scrape plates; wipe pans with paper towel first; collect cool fats in a jar and bin it.
Chemicals: Choose septic-friendly cleaners (enzyme/oxygen-based). For mould or disinfection, use light, regular cleaning—not shock doses.
Paint/solvents: Use community drop-offs; never wash brushes to the drain.
Food scraps: Use a countertop caddy and compost or bin.
Hair/solids: Fit mesh strainers in showers and sinks; empty to bin weekly.
Daily & weekly routines (5-minute wins)
Kitchen: Wipe pans before washing; check sink strainer; keep a “grease jar.”
Bathrooms: Clear hair catchers; bin wipes/cotton pads; keep a “ring dish” to remove jewellery before washing up.
Laundry: Dose per label; choose low-phosphate, low-surfactant detergents marked septic-safe.
Seasonal and annual habits
Quarterly: Inspect irrigation zone for soggy patches or weak spray (could indicate a partial blockage); clean sprinkler filters if present.
Half-yearly: Check tank lids, risers and inspection points are intact and child-safe; confirm alarm tests.
Annually: Book a service (for AWTS this is often council-mandated). Ask the technician to:
Measure sludge/scum levels
Inspect baffles, pumps, floats, air lines and diffusers
Test chlorination (if applicable) and irrigation performance
Pump-out timing: Depends on household size/usage and what you put in. Good input control extends intervals and saves money.
Myths that quietly cost you money
“Flushable means fine.” It doesn’t. They fail to disperse like toilet paper.
“Additives let me pour anything.” No additive neutralises solids/FOG/solvents. Source control wins every time.
“One big bleach hit fixes smells.” It kills bacteria and backfires. Treat the cause (usually inputs), not the biology.
Troubleshooting: early signs of trouble (and what to do)
Gurgling drains / slow fixtures: Likely partial blockage—check strainers, avoid further inputs, call a licensed plumber if persistent.
Wet patches/odour near irrigation: Could be clogged sprinklers/filters or poor treatment—book a service.
Alarm sounding (AWTS): Silence per your panel instructions and call service promptly; avoid heavy water use until checked.
Backflow into lowest fixture: Stop using water immediately and call a professional—pushing water can worsen the blockage.
Eco Septic system care checklist (print for the kitchen)
Bin wipes, FOG, coffee grounds, floss, hair, sanitary items.
Use septic-friendly cleaners; avoid shock dosing bleach.
Fit strainers; empty to bin.
Keep a grease jar and ring dishes by sinks.
Book your Eco Septic service annually (or as council requires).
Keep lids secure; never enter a tank (confined space hazard).
FAQs
Q: Can I use a garbage disposal with an EcoSeptic system?
A: We don’t recommend it. It accelerates sludge build-up and increases pump-out frequency.
Q: Are disinfectant wipes OK if I only use them occasionally?
A: They still don’t break down. Even “rarely” creates cumulative risk in bends, pumps and filters—bin them.
Q: What cleaners are best?
A: Look for “septic-safe,” enzyme/oxygen-based products. Use modest doses frequently rather than harsh shock treatments.
Q: Do water softeners/spa backwash affect performance?
A: High salinity and chlorine can upset biology and corrode components. Discharge to dedicated, compliant disposal—not the system—unless your installer has designed for it.
Call EcoSeptic if…
You suspect wipes/FOG entry, smell odours, or see wet patches
Your alarm activates or irrigation looks weak/uneven
You’re due for a scheduled service or pump-out guidance
EcoSeptic — Leaders in Australian-Made Wastewater Technologies and Rainwater Harvesting Solutions.
Call: 1800 808 135 • Web:www.ecoseptic.com.au
