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Can I use Sensitive Laundry Sheets with septic and greywater systems?Updated 11 days ago

TL;DR: Yes. Sensitive Laundry Sheets work with most domestic septic tanks and greywater systems at the recommended dose: one sheet per normal load, two for large or heavily soiled loads. A good fit for rural, regional, off-grid, and mobile households. For greywater used on edible plants or surface irrigation, check your local regulations first.


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Koh Sensitive Laundry Sheets
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Can I use Sensitive Laundry Sheets with septic and greywater systems?

Yes. Sensitive Laundry Sheets are compatible with most domestic septic tanks and greywater systems when used at the recommended dose. Use one sheet for normal loads and two for large or heavily soiled loads. For subsurface or non-edible garden greywater use, normal loads are typically fine. For surface irrigation or use on edible plants, check your local regulations and best-practice guidance.

✓ Septic tanks

At the recommended dose, Sensitive Laundry Sheets work with most domestic septic systems. Stick to the dosing guidelines and don't repeatedly over-concentrate detergent in a single load. Keep to your regular septic maintenance and pump-out schedule to support the tank's biological balance.

Septic compatible Use recommended dose Rural and regional

✓ Greywater systems and irrigation

If your laundry wastewater feeds a greywater system, follow local guidance on acceptable detergents and where the water can go. Subsurface or non-edible garden use is usually fine at the recommended sheet per load. For surface irrigation or use on edible plants, check your local regulations and best-practice guidance first.

Greywater compatible Check local regulations Off-grid Mobile and caravan

How do I use them safely on septic or greywater?

Stick to the recommended dose: one Sensitive Laundry Sheet for normal loads and two for large or heavily soiled loads. Don't exceed dosing or repeatedly run concentrated loads. Don't pour dissolved solution directly into soil or drains. Don't dump handwash rinse water onto edible garden beds. Keep to your regular septic maintenance and pump-out schedule.

⚠ Avoid these mistakes

Don't exceed the recommended dose. Stick to one sheet for a normal load and two for large or heavily soiled loads.

Don't pour concentrated or dissolved solution directly into soil or drains.

Don't tip handwash rinse water onto edible garden beds. Use the regular drain or a non-edible garden zone.

Don't skip regular septic maintenance. Stay on the pump-out schedule recommended by your service provider.

Koh Sensitive Laundry Sheets

Sensitive Laundry Sheets

Pre-measured detergent in a paper-thin sheet. Drop one in the drum and you're done.

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Last reviewed: May 2026

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