Bio or Non-Bio? What to Use for Bedding, Towels, Gym Kit and Wool
Most articles on this answer the question in the abstract. The useful version is load by load.
- Use bio for bedding, towels, gym kit and whites — its enzymes break down the sweat and body-oil residue those loads carry.
- Keep wool, silk and cashmere on non-bio, because they are protein fibres that the protease enzymes in bio detergent gradually digest.
- Bio and non-bio come in every format — sheet, liquid, powder or pod — so the format does not change the enzyme question.
What is the actual difference?
Biological detergent contains enzymes — typically protease, amylase and lipase, which break down protein, starch and fat respectively. They are catalysts: they chop large stain molecules into smaller ones that the surfactants can then carry away. That is why bio is so much better at low temperatures. It is doing chemically what a hot wash used to do thermally.
Non-bio contains no enzymes. It relies on surfactants alone, which means it works, but works harder — and it is measurably less effective on body-based stains at 30°C.
Both clean. The difference is what they are good at, and what they will damage.
The load-by-load answer
| Load | Use | Why |
|---|---|---|
| Bedding | Bio | Sheets accumulate sweat and skin oils — exactly what protease and lipase are for. Bio is the right call at 30°C or 40°C. |
| Towels | Bio | Same reasoning, plus towels need a proper clean to stay absorbent. Skip the conditioner — it coats the pile and kills absorbency. |
| Gym kit and sportswear | Bio | The odour is body oil trapped in synthetic fibre. Lipase targets exactly that. Non-bio struggles here. |
| Whites | Bio | Better stain removal and better at keeping whites from going grey over time. |
| Wool, cashmere, silk | Non-bio | These are protein fibres. Protease does not distinguish between a protein stain and a protein fabric. |
| Coloureds | Either | Enzymes do not attack dye. Wash cool and inside out and colour holds either way. |
| Everyday shirts and t-shirts | Bio | Collar and cuff marks are sebum. That is a lipase job. |
Why you must not use bio on wool
This is the part almost every article on this subject omits, and it is the only genuinely important thing on the page.
Wool, cashmere, silk and alpaca are made of protein — keratin in wool, fibroin in silk. Protease enzymes exist to break peptide bonds. They cannot tell the difference between the protein in a food stain and the protein the jumper is made of.
One bio wash will not visibly destroy a wool jumper. Repeated bio washes will thin it, roughen it and cause it to lose shape and shed, and the damage is cumulative and irreversible. If you own good knitwear, keep a small box of non-bio or a dedicated wool detergent for it. It is the cheapest insurance in the house.
Is bio or non-bio better for bedding?
Bio, clearly. Bedding is the single most sweat-and-oil-loaded thing most people wash, and enzymes are the tool built for it. Wash at 40°C occasionally and 30°C the rest of the time.
The exception is a pure silk pillowcase, which follows the wool rule.
Is non-bio gentler?
On protein fabrics, unambiguously yes, and that is a genuine and important difference.
Beyond that, be careful with the word. Non-bio is widely chosen for babies' clothing and by people who prefer to avoid enzyme-based detergents, and that is a perfectly reasonable preference. But “non-bio” describes the absence of enzymes and nothing else — it says nothing about fragrance, preservatives or any other ingredient, and no detergent of either type should be presented as suitable for sensitive skin without evidence behind that specific claim.
Does the detergent format change the answer?
No. Bio and non-bio exist as liquid, powder, capsules and sheets. The enzyme question is about what is in the formula, not what shape it arrives in. Sheets, liquid and pods all come in both versions across the market.
Element's detergent sheets are biological — the formula uses enzymes. That makes them the right tool for shirts, bedding and gym kit, and the wrong tool for wool, silk and cashmere, where you want a dedicated wool wash. We do not currently offer a non-bio variant.
Related reading: bio vs non-bio, explained properly · what actually works on gym kit · how to wash linen.
Common questions
Is bio or non-bio better for bedding?
Bio. Bedding accumulates sweat and skin oils, which are exactly what the protease and lipase enzymes in biological detergent are designed to break down. Wash at 30C most weeks and 40C occasionally. The exception is pure silk bedding, which should be washed with non-bio because silk is a protein fibre.
Can you use bio detergent on wool?
No. Wool, cashmere, silk and alpaca are protein fibres, and the protease enzymes in biological detergent break peptide bonds. They cannot distinguish between the protein in a stain and the protein the garment is made of. A single wash will not visibly destroy a jumper, but repeated bio washes thin the fibre, roughen the texture and cause shedding, and the damage is cumulative and irreversible.
Should you use bio or non-bio for gym clothes?
Bio. The persistent odour in sportswear comes from body oils trapped in synthetic fibre, and lipase is the enzyme that targets fats and oils. Non-bio relies on surfactants alone and is measurably less effective on this at 30C. Avoid fabric conditioner on technical fabric, which seals residue in and blocks wicking.
Is non-bio detergent gentler than bio?
On protein fabrics such as wool, silk and cashmere, yes, and that difference is real and important. Beyond that, non-bio simply means the formula contains no enzymes. It says nothing about fragrance, preservatives or other ingredients, and no detergent of either type should be described as suitable for sensitive skin without specific evidence for that claim.
Are laundry sheets bio or non-bio?
Both exist. Bio and non-bio are properties of the formula, not the format, and detergent sheets are sold in both versions across the market. Check the individual product rather than assuming the format tells you. For wool, cashmere and silk, use a dedicated non-bio or wool detergent whatever the format.
