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Is Kitchen Grease & Oil Cleaner safe for septic and greywater systems?Updated 4 days ago

TL;DR: Yes. Kitchen Grease & Oil Cleaner is septic and greywater compatible when used as directed. Use the recommended amount, rinse thoroughly with water after cleaning, and avoid pouring large amounts undiluted down the drain. Suitable for rural properties, off-grid homes, camper vans, caravans, and boats. Always follow your local council's guidance for greywater reuse, particularly for garden irrigation.


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Koh Kitchen Grease and Oil Cleaner safe
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Is Kitchen Grease & Oil Cleaner safe for septic and greywater systems?

Yes. Kitchen Grease & Oil Cleaner is septic and greywater compatible when used as directed. Use the recommended amount, rinse thoroughly with water after cleaning, and avoid pouring large amounts undiluted down the drain. Suitable for rural properties, off-grid setups, camper vans, caravans, motorhomes, boats, and narrowboats. The formula is mildly alkaline at pH 8.5, made from readily biodegradable ingredients, contains no chlorine bleach, and no phosphates, all of which help maintain healthy septic system biology. Always follow your local council's guidance for greywater reuse and disposal, particularly if you reuse greywater for garden irrigation.

✓ How to use with septic or greywater

Use the recommended amount. Rinse or wipe with water after cleaning so any residue is diluted and removed. More product doesn't clean better, it only increases outflow load on your system.

Septic safe Greywater safe Rinse after use

✓ Suitable for rural and mobile setups

If your home relies on a septic tank, greywater system, or portable water setup, Kitchen Grease & Oil Cleaner is a reliable choice. Follow your system's manual and your local council's guidance for drains and greywater reuse.

Rural properties Off-grid Caravans & motorhomes Boats

What makes it septic-safe?

Septic systems rely on living bacteria to break down waste. Strong oxidisers (chlorine bleach), high-pH alkalis, antibacterial agents, and certain non-biodegradable additives can disrupt or kill that bacterial activity, slowing the system down or causing failure. Kitchen Grease & Oil Cleaner is mildly alkaline at pH 8.5 (well below the threshold that disrupts septic biology), made from readily biodegradable ingredients, contains no chlorine bleach, and no phosphates. The enzymes in the formula (lipase and protease) are biological catalysts that break down at the same rate as the food residues they target, leaving no persistent residue in the outflow. Used as directed and rinsed thoroughly, it doesn't disrupt septic system function.

✓ Mildly alkaline pH

pH 8.5 is well below the threshold that disrupts septic system biology.

✓ No chlorine bleach

Chlorine bleach kills septic bacteria. Kitchen Grease & Oil Cleaner contains no chlorine bleach or other strong oxidisers.

✓ Made from readily biodegradable ingredients

The surfactants and enzymes break down through normal biological processes rather than persisting in the outflow.

✓ No phosphates

Phosphates contribute to algal blooms in waterways. Septic-safe and greywater reuse is cleaner without them.

How do I dispose of leftover product?

Best option is to use it up on cleaning jobs, that's what it's designed for. If disposal of leftover product is necessary, dilute well with plenty of water as you pour and don't mix with other chemicals. Don't pour large amounts of undiluted product down the drain or into a greywater system in one go. Always follow your local council's guidance for drain disposal and greywater reuse, particularly if you reuse greywater for garden irrigation.

⚠ Use it up or dilute well

Best option is to use it up on cleaning jobs, that's what it's designed for. If disposal is necessary, dilute well with plenty of water as you pour and don't mix with other chemicals. Don't pour large amounts undiluted down the drain. Always follow your local council's guidance for drain disposal and greywater reuse.

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Last reviewed: July 2026 · Koh UK

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