Stop Septic Tank Smells: Why Natural Septic Treatments Work Better

If your septic tank smells like rotten eggs or gives off an unpleasant odour—especially after rain—you're not alone. “Septic tank smells” is one of the most common homeowner complaints across New Zealand. Traditional chemical treatments can mask the problem short-term, but for long-lasting relief and a healthier system, natural biological treatments like Bio-Zyme work better and are safer for your property, plumbing, and the environment.

Why Natural is Better for Septic Tank Odours

Traditional cleaners and harsh chemical septic additives can kill the good bacteria that your septic system relies on. Bio-Zyme, a biological enzyme treatment, works differently. It adds live, eco-friendly microbes that digest solid waste and reduce odours at the source.

4 Actionable Strategies to Keep Your Septic System Smelling Fresh

1. Use a Natural Enzyme Treatment Like Bio-Zyme

Bio-Zyme is a septic tank smell solution that restores the microbial balance in your tank. It contains living cultures that actively break down organic matter, making it a powerful septic tank smell remover. Unlike bleach or chemical cleaners, it works with—not against—your system.

2. Maintain a Regular Treatment Schedule

Smells often return when treatment is sporadic. Rain and temperature changes can stir up gases, especially if your system is overdue. We recommend dosing Bio-Zyme monthly for average use. 

3. Avoid Anti-Bacterial Soaps and Harsh Cleaners

These products can kill beneficial bacteria in your tank, leading to slower waste breakdown and stronger smells. Switch to septic-safe, biodegradable soaps and cleaners where possible. Be aware of medications that may also affect your septic system.

4. Reduce System Overload

Too much water use (e.g., laundry marathons or long showers) can push solids into your drainfield. Try spacing out loads, fixing leaky taps, and limiting use of high-sodium cleaners.

Download Our Free Septic Smell Solution Checklist

Stay on top of your septic tank health with this free printable checklist from Insinc Products. It helps you spot early signs of trouble, avoid costly damage, and get the most out of your Bio-Zyme treatment.

Download the Checklist

FAQ – Answering Your Septic Tank Questions

Q: Why does my septic tank smell when it rains?
A: When it rains, groundwater can saturate your drain field and force gases back into the home. Regular enzyme treatment helps by keeping solids from backing up and ensuring smoother breakdown.

Q: How long before Bio-Zyme works?
A: Most users report noticeable odour reduction within 24–72 hours. For long-term benefits, regular monthly treatment is recommended.

Q: How do I use Bio-Zyme?
A: Bio-zyme can be flushed down your toilet and straight into your septic tank. You may need to kick start your system with a shock dose but then regular use will keep the smells under control. As a bonus if you use Bio-Zyme Cleaner for general household cleaning like floors, flush the waste water down the toilet, it will help keep your drains clean and benefit your septic tank. This downlable brochure shows you how to use Bio-zyme in septic tanks.

Q: Is Bio-Zyme safe for homes with pets or on tank water?
A: Yes! Bio-Zyme is non-toxic, biodegradable, and contains no harmful chemicals. It’s safe for all household types, including those using rainwater collection.

Q: Where can I buy Bio-Zyme in New Zealand?
A: Right here at Insinc Products. We’re NZ-owned and focus on planet-friendly hygiene solutions for homes, businesses, and commercial facilities.

Summary

Don’t just cover the smell—treat it naturally with Bio-Zyme. By boosting the good bacteria in your tank, you’ll experience fewer smells, fewer problems, and better overall performance. Bio-Zyme is NZ’s go-to natural septic tank smell solution—trusted by environmentally-conscious homes and workplaces alike.