Is Bathroom & Shower Cleaner septic safe?Updated 8 hours ago
TL;DR: Yes, when used as directed. Bathroom & Shower Cleaner is formulated without the ingredients most commonly flagged for septic harm: no chlorine bleach, no phosphates, no quaternary ammonium disinfectants, no added fragrance. It is low in sodium and readily biodegradable, and it is greywater compatible. The reason it suits septic systems is the same reason it carries no germ-kill claim: it is a cleaner, not a disinfectant, so it is not designed to kill the bacteria your tank depends on. Use it as directed, and never pour neat product into a tank or drain.
Is Bathroom & Shower Cleaner septic safe?
✓ Free from the chemistries that harm septic systems
No chlorine bleach. No phosphates. No quaternary ammonium disinfectants. No added fragrance. Low in sodium and readily biodegradable. Compatible with greywater systems as well as septic tanks.
⚠ Use as directed
Follow the dosage and dilution guidance on the pack. Do not pour neat product directly into a septic tank, drain or greywater system. Avoid using far more than a normal cleaning job needs. Septic safety here means the product rinsing away at normal cleaning concentrations, not the product being poured in as a treatment.
Why do septic bacteria matter?
✓ The microbes are doing the work
Septic tanks and package sewage treatment plants rely on bacteria to break household waste down. Cleaners built around chlorine bleach or antibacterial actives kill those bacteria along with everything else, the colony crashes, and the system stops working. Bathroom & Shower Cleaner cleans without disrupting them.
⚠ It is a cleaner, not a disinfectant
Bathroom & Shower Cleaner is not a disinfectant, sanitiser or mould killer. It is not tested against antimicrobial standards and it holds no biocidal product authorisation in Great Britain, so Koh makes no germ-kill claim for it. That is the trade-off, and in a septic home it is the point: a product that killed bacteria on your tiles would kill them in your tank too.
Is it suitable for rural homes, caravans and boats?
✓ Off-mains homes
Suits rural and off-mains properties running a septic tank, a package sewage treatment plant or a greywater system. Readily biodegradable, no chlorine, no phosphates, low sodium.
✓ Caravans, motorhomes and boats
Works the same way in a van, motorhome or boat washroom with a holding tank. If you use a proprietary tank additive, follow that product's own guidance alongside ours.
Twelve ingredients, pH 8, readily biodegradable, made in Australia. No chlorine, no phosphates, low sodium.
Foaming Spray Bottle · keeps the dose right
Delivers the product as foam at the intended rate, which is the easiest way to stay within as-directed use in a septic home.
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Last reviewed: August 2026 · Koh UK